/*  Prototype JavaScript framework, version 1.6.0.3
 *  (c) 2005-2008 Sam Stephenson
 *
 *  Prototype is freely distributable under the terms of an MIT-style license.
 *  For details, see the Prototype web site: http://www.prototypejs.org/
 *
 *--------------------------------------------------------------------------*/

var Prototype = {
  Version: '1.6.0.3',

  Browser: {
    IE:     !!(window.attachEvent &&
      navigator.userAgent.indexOf('Opera') === -1),
    Opera:  navigator.userAgent.indexOf('Opera') > -1,
    WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
    Gecko:  navigator.userAgent.indexOf('Gecko') > -1 &&
      navigator.userAgent.indexOf('KHTML') === -1,
    MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
  },

  BrowserFeatures: {
    XPath: !!document.evaluate,
    SelectorsAPI: !!document.querySelector,
    ElementExtensions: !!window.HTMLElement,
    SpecificElementExtensions:
      document.createElement('div')['__proto__'] &&
      document.createElement('div')['__proto__'] !==
        document.createElement('form')['__proto__']
  },

  ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
  JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

  emptyFunction: function() { },
  K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
  Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
  create: function() {
    var parent = null, properties = $A(arguments);
    if (Object.isFunction(properties[0]))
      parent = properties.shift();

    function klass() {
      this.initialize.apply(this, arguments);
    }

    Object.extend(klass, Class.Methods);
    klass.superclass = parent;
    klass.subclasses = [];

    if (parent) {
      var subclass = function() { };
      subclass.prototype = parent.prototype;
      klass.prototype = new subclass;
      parent.subclasses.push(klass);
    }

    for (var i = 0; i < properties.length; i++)
      klass.addMethods(properties[i]);

    if (!klass.prototype.initialize)
      klass.prototype.initialize = Prototype.emptyFunction;

    klass.prototype.constructor = klass;

    return klass;
  }
};

Class.Methods = {
  addMethods: function(source) {
    var ancestor   = this.superclass && this.superclass.prototype;
    var properties = Object.keys(source);

    if (!Object.keys({ toString: true }).length)
      properties.push("toString", "valueOf");

    for (var i = 0, length = properties.length; i < length; i++) {
      var property = properties[i], value = source[property];
      if (ancestor && Object.isFunction(value) &&
          value.argumentNames().first() == "$super") {
        var method = value;
        value = (function(m) {
          return function() { return ancestor[m].apply(this, arguments) };
        })(property).wrap(method);

        value.valueOf = method.valueOf.bind(method);
        value.toString = method.toString.bind(method);
      }
      this.prototype[property] = value;
    }

    return this;
  }
};

var Abstract = { };

Object.extend = function(destination, source) {
  for (var property in source)
    destination[property] = source[property];
  return destination;
};

Object.extend(Object, {
  inspect: function(object) {
    try {
      if (Object.isUndefined(object)) return 'undefined';
      if (object === null) return 'null';
      return object.inspect ? object.inspect() : String(object);
    } catch (e) {
      if (e instanceof RangeError) return '...';
      throw e;
    }
  },

  toJSON: function(object) {
    var type = typeof object;
    switch (type) {
      case 'undefined':
      case 'function':
      case 'unknown': return;
      case 'boolean': return object.toString();
    }

    if (object === null) return 'null';
    if (object.toJSON) return object.toJSON();
    if (Object.isElement(object)) return;

    var results = [];
    for (var property in object) {
      var value = Object.toJSON(object[property]);
      if (!Object.isUndefined(value))
        results.push(property.toJSON() + ': ' + value);
    }

    return '{' + results.join(', ') + '}';
  },

  toQueryString: function(object) {
    return $H(object).toQueryString();
  },

  toHTML: function(object) {
    return object && object.toHTML ? object.toHTML() : String.interpret(object);
  },

  keys: function(object) {
    var keys = [];
    for (var property in object)
      keys.push(property);
    return keys;
  },

  values: function(object) {
    var values = [];
    for (var property in object)
      values.push(object[property]);
    return values;
  },

  clone: function(object) {
    return Object.extend({ }, object);
  },

  isElement: function(object) {
    return !!(object && object.nodeType == 1);
  },

  isArray: function(object) {
    return object != null && typeof object == "object" &&
      'splice' in object && 'join' in object;
  },

  isHash: function(object) {
    return object instanceof Hash;
  },

  isFunction: function(object) {
    return typeof object == "function";
  },

  isString: function(object) {
    return typeof object == "string";
  },

  isNumber: function(object) {
    return typeof object == "number";
  },

  isUndefined: function(object) {
    return typeof object == "undefined";
  }
});

Object.extend(Function.prototype, {
  argumentNames: function() {
    var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
      .replace(/\s+/g, '').split(',');
    return names.length == 1 && !names[0] ? [] : names;
  },

  bind: function() {
    if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
    var __method = this, args = $A(arguments), object = args.shift();
    return function() {
      return __method.apply(object, args.concat($A(arguments)));
    }
  },

  bindAsEventListener: function() {
    var __method = this, args = $A(arguments), object = args.shift();
    return function(event) {
      return __method.apply(object, [event || window.event].concat(args));
    }
  },

  curry: function() {
    if (!arguments.length) return this;
    var __method = this, args = $A(arguments);
    return function() {
      return __method.apply(this, args.concat($A(arguments)));
    }
  },

  delay: function() {
    var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
    return window.setTimeout(function() {
      return __method.apply(__method, args);
    }, timeout);
  },

  defer: function() {
    var args = [0.01].concat($A(arguments));
    return this.delay.apply(this, args);
  },

  wrap: function(wrapper) {
    var __method = this;
    return function() {
      return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
    }
  },

  methodize: function() {
    if (this._methodized) return this._methodized;
    var __method = this;
    return this._methodized = function() {
      return __method.apply(null, [this].concat($A(arguments)));
    };
  }
});

Date.prototype.toJSON = function() {
  return '"' + this.getUTCFullYear() + '-' +
    (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
    this.getUTCDate().toPaddedString(2) + 'T' +
    this.getUTCHours().toPaddedString(2) + ':' +
    this.getUTCMinutes().toPaddedString(2) + ':' +
    this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
  these: function() {
    var returnValue;

    for (var i = 0, length = arguments.length; i < length; i++) {
      var lambda = arguments[i];
      try {
        returnValue = lambda();
        break;
      } catch (e) { }
    }

    return returnValue;
  }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
  return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
  initialize: function(callback, frequency) {
    this.callback = callback;
    this.frequency = frequency;
    this.currentlyExecuting = false;

    this.registerCallback();
  },

  registerCallback: function() {
    this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
  },

  execute: function() {
    this.callback(this);
  },

  stop: function() {
    if (!this.timer) return;
    clearInterval(this.timer);
    this.timer = null;
  },

  onTimerEvent: function() {
    if (!this.currentlyExecuting) {
      try {
        this.currentlyExecuting = true;
        this.execute();
      } finally {
        this.currentlyExecuting = false;
      }
    }
  }
});
Object.extend(String, {
  interpret: function(value) {
    return value == null ? '' : String(value);
  },
  specialChar: {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\\': '\\\\'
  }
});

Object.extend(String.prototype, {
  gsub: function(pattern, replacement) {
    var result = '', source = this, match;
    replacement = arguments.callee.prepareReplacement(replacement);

    while (source.length > 0) {
      if (match = source.match(pattern)) {
        result += source.slice(0, match.index);
        result += String.interpret(replacement(match));
        source  = source.slice(match.index + match[0].length);
      } else {
        result += source, source = '';
      }
    }
    return result;
  },

  sub: function(pattern, replacement, count) {
    replacement = this.gsub.prepareReplacement(replacement);
    count = Object.isUndefined(count) ? 1 : count;

    return this.gsub(pattern, function(match) {
      if (--count < 0) return match[0];
      return replacement(match);
    });
  },

  scan: function(pattern, iterator) {
    this.gsub(pattern, iterator);
    return String(this);
  },

  truncate: function(length, truncation) {
    length = length || 30;
    truncation = Object.isUndefined(truncation) ? '...' : truncation;
    return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
  },

  strip: function() {
    return this.replace(/^\s+/, '').replace(/\s+$/, '');
  },

  stripTags: function() {
    return this.replace(/<\/?[^>]+>/gi, '');
  },

  stripScripts: function() {
    return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
  },

  extractScripts: function() {
    var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
    var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
    return (this.match(matchAll) || []).map(function(scriptTag) {
      return (scriptTag.match(matchOne) || ['', ''])[1];
    });
  },

  evalScripts: function() {
    return this.extractScripts().map(function(script) { return eval(script) });
  },

  escapeHTML: function() {
    var self = arguments.callee;
    self.text.data = this;
    return self.div.innerHTML;
  },

  unescapeHTML: function() {
    var div = new Element('div');
    div.innerHTML = this.stripTags();
    return div.childNodes[0] ? (div.childNodes.length > 1 ?
      $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
      div.childNodes[0].nodeValue) : '';
  },

  toQueryParams: function(separator) {
    var match = this.strip().match(/([^?#]*)(#.*)?$/);
    if (!match) return { };

    return match[1].split(separator || '&').inject({ }, function(hash, pair) {
      if ((pair = pair.split('='))[0]) {
        var key = decodeURIComponent(pair.shift());
        var value = pair.length > 1 ? pair.join('=') : pair[0];
        if (value != undefined) value = decodeURIComponent(value);

        if (key in hash) {
          if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
          hash[key].push(value);
        }
        else hash[key] = value;
      }
      return hash;
    });
  },

  toArray: function() {
    return this.split('');
  },

  succ: function() {
    return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
  },

  times: function(count) {
    return count < 1 ? '' : new Array(count + 1).join(this);
  },

  camelize: function() {
    var parts = this.split('-'), len = parts.length;
    if (len == 1) return parts[0];

    var camelized = this.charAt(0) == '-'
      ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
      : parts[0];

    for (var i = 1; i < len; i++)
      camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

    return camelized;
  },

  capitalize: function() {
    return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
  },

  underscore: function() {
    return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
  },

  dasherize: function() {
    return this.gsub(/_/,'-');
  },

  inspect: function(useDoubleQuotes) {
    var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
      var character = String.specialChar[match[0]];
      return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
    });
    if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
    return "'" + escapedString.replace(/'/g, '\\\'') + "'";
  },

  toJSON: function() {
    return this.inspect(true);
  },

  unfilterJSON: function(filter) {
    return this.sub(filter || Prototype.JSONFilter, '#{1}');
  },

  isJSON: function() {
    var str = this;
    if (str.blank()) return false;
    str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
    return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
  },

  evalJSON: function(sanitize) {
    var json = this.unfilterJSON();
    try {
      if (!sanitize || json.isJSON()) return eval('(' + json + ')');
    } catch (e) { }
    throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
  },

  include: function(pattern) {
    return this.indexOf(pattern) > -1;
  },

  startsWith: function(pattern) {
    return this.indexOf(pattern) === 0;
  },

  endsWith: function(pattern) {
    var d = this.length - pattern.length;
    return d >= 0 && this.lastIndexOf(pattern) === d;
  },

  empty: function() {
    return this == '';
  },

  blank: function() {
    return /^\s*$/.test(this);
  },

  interpolate: function(object, pattern) {
    return new Template(this, pattern).evaluate(object);
  }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
  escapeHTML: function() {
    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
  },
  unescapeHTML: function() {
    return this.stripTags().replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
  }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
  if (Object.isFunction(replacement)) return replacement;
  var template = new Template(replacement);
  return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
  div:  document.createElement('div'),
  text: document.createTextNode('')
});

String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);

var Template = Class.create({
  initialize: function(template, pattern) {
    this.template = template.toString();
    this.pattern = pattern || Template.Pattern;
  },

  evaluate: function(object) {
    if (Object.isFunction(object.toTemplateReplacements))
      object = object.toTemplateReplacements();

    return this.template.gsub(this.pattern, function(match) {
      if (object == null) return '';

      var before = match[1] || '';
      if (before == '\\') return match[2];

      var ctx = object, expr = match[3];
      var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
      match = pattern.exec(expr);
      if (match == null) return before;

      while (match != null) {
        var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
        ctx = ctx[comp];
        if (null == ctx || '' == match[3]) break;
        expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
        match = pattern.exec(expr);
      }

      return before + String.interpret(ctx);
    });
  }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
  each: function(iterator, context) {
    var index = 0;
    try {
      this._each(function(value) {
        iterator.call(context, value, index++);
      });
    } catch (e) {
      if (e != $break) throw e;
    }
    return this;
  },

  eachSlice: function(number, iterator, context) {
    var index = -number, slices = [], array = this.toArray();
    if (number < 1) return array;
    while ((index += number) < array.length)
      slices.push(array.slice(index, index+number));
    return slices.collect(iterator, context);
  },

  all: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = true;
    this.each(function(value, index) {
      result = result && !!iterator.call(context, value, index);
      if (!result) throw $break;
    });
    return result;
  },

  any: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result = false;
    this.each(function(value, index) {
      if (result = !!iterator.call(context, value, index))
        throw $break;
    });
    return result;
  },

  collect: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];
    this.each(function(value, index) {
      results.push(iterator.call(context, value, index));
    });
    return results;
  },

  detect: function(iterator, context) {
    var result;
    this.each(function(value, index) {
      if (iterator.call(context, value, index)) {
        result = value;
        throw $break;
      }
    });
    return result;
  },

  findAll: function(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (iterator.call(context, value, index))
        results.push(value);
    });
    return results;
  },

  grep: function(filter, iterator, context) {
    iterator = iterator || Prototype.K;
    var results = [];

    if (Object.isString(filter))
      filter = new RegExp(filter);

    this.each(function(value, index) {
      if (filter.match(value))
        results.push(iterator.call(context, value, index));
    });
    return results;
  },

  include: function(object) {
    if (Object.isFunction(this.indexOf))
      if (this.indexOf(object) != -1) return true;

    var found = false;
    this.each(function(value) {
      if (value == object) {
        found = true;
        throw $break;
      }
    });
    return found;
  },

  inGroupsOf: function(number, fillWith) {
    fillWith = Object.isUndefined(fillWith) ? null : fillWith;
    return this.eachSlice(number, function(slice) {
      while(slice.length < number) slice.push(fillWith);
      return slice;
    });
  },

  inject: function(memo, iterator, context) {
    this.each(function(value, index) {
      memo = iterator.call(context, memo, value, index);
    });
    return memo;
  },

  invoke: function(method) {
    var args = $A(arguments).slice(1);
    return this.map(function(value) {
      return value[method].apply(value, args);
    });
  },

  max: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index);
      if (result == null || value >= result)
        result = value;
    });
    return result;
  },

  min: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var result;
    this.each(function(value, index) {
      value = iterator.call(context, value, index);
      if (result == null || value < result)
        result = value;
    });
    return result;
  },

  partition: function(iterator, context) {
    iterator = iterator || Prototype.K;
    var trues = [], falses = [];
    this.each(function(value, index) {
      (iterator.call(context, value, index) ?
        trues : falses).push(value);
    });
    return [trues, falses];
  },

  pluck: function(property) {
    var results = [];
    this.each(function(value) {
      results.push(value[property]);
    });
    return results;
  },

  reject: function(iterator, context) {
    var results = [];
    this.each(function(value, index) {
      if (!iterator.call(context, value, index))
        results.push(value);
    });
    return results;
  },

  sortBy: function(iterator, context) {
    return this.map(function(value, index) {
      return {
        value: value,
        criteria: iterator.call(context, value, index)
      };
    }).sort(function(left, right) {
      var a = left.criteria, b = right.criteria;
      return a < b ? -1 : a > b ? 1 : 0;
    }).pluck('value');
  },

  toArray: function() {
    return this.map();
  },

  zip: function() {
    var iterator = Prototype.K, args = $A(arguments);
    if (Object.isFunction(args.last()))
      iterator = args.pop();

    var collections = [this].concat(args).map($A);
    return this.map(function(value, index) {
      return iterator(collections.pluck(index));
    });
  },

  size: function() {
    return this.toArray().length;
  },

  inspect: function() {
    return '#<Enumerable:' + this.toArray().inspect() + '>';
  }
};

Object.extend(Enumerable, {
  map:     Enumerable.collect,
  find:    Enumerable.detect,
  select:  Enumerable.findAll,
  filter:  Enumerable.findAll,
  member:  Enumerable.include,
  entries: Enumerable.toArray,
  every:   Enumerable.all,
  some:    Enumerable.any
});
function $A(iterable) {
  if (!iterable) return [];
  if (iterable.toArray) return iterable.toArray();
  var length = iterable.length || 0, results = new Array(length);
  while (length--) results[length] = iterable[length];
  return results;
}

if (Prototype.Browser.WebKit) {
  $A = function(iterable) {
    if (!iterable) return [];
    // In Safari, only use the `toArray` method if it's not a NodeList.
    // A NodeList is a function, has an function `item` property, and a numeric
    // `length` property. Adapted from Google Doctype.
    if (!(typeof iterable === 'function' && typeof iterable.length ===
        'number' && typeof iterable.item === 'function') && iterable.toArray)
      return iterable.toArray();
    var length = iterable.length || 0, results = new Array(length);
    while (length--) results[length] = iterable[length];
    return results;
  };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
  _each: function(iterator) {
    for (var i = 0, length = this.length; i < length; i++)
      iterator(this[i]);
  },

  clear: function() {
    this.length = 0;
    return this;
  },

  first: function() {
    return this[0];
  },

  last: function() {
    return this[this.length - 1];
  },

  compact: function() {
    return this.select(function(value) {
      return value != null;
    });
  },

  flatten: function() {
    return this.inject([], function(array, value) {
      return array.concat(Object.isArray(value) ?
        value.flatten() : [value]);
    });
  },

  without: function() {
    var values = $A(arguments);
    return this.select(function(value) {
      return !values.include(value);
    });
  },

  reverse: function(inline) {
    return (inline !== false ? this : this.toArray())._reverse();
  },

  reduce: function() {
    return this.length > 1 ? this : this[0];
  },

  uniq: function(sorted) {
    return this.inject([], function(array, value, index) {
      if (0 == index || (sorted ? array.last() != value : !array.include(value)))
        array.push(value);
      return array;
    });
  },

  intersect: function(array) {
    return this.uniq().findAll(function(item) {
      return array.detect(function(value) { return item === value });
    });
  },

  clone: function() {
    return [].concat(this);
  },

  size: function() {
    return this.length;
  },

  inspect: function() {
    return '[' + this.map(Object.inspect).join(', ') + ']';
  },

  toJSON: function() {
    var results = [];
    this.each(function(object) {
      var value = Object.toJSON(object);
      if (!Object.isUndefined(value)) results.push(value);
    });
    return '[' + results.join(', ') + ']';
  }
});

// use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
  Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
  i || (i = 0);
  var length = this.length;
  if (i < 0) i = length + i;
  for (; i < length; i++)
    if (this[i] === item) return i;
  return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
  i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
  var n = this.slice(0, i).reverse().indexOf(item);
  return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
  if (!Object.isString(string)) return [];
  string = string.strip();
  return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
  Array.prototype.concat = function() {
    var array = [];
    for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
    for (var i = 0, length = arguments.length; i < length; i++) {
      if (Object.isArray(arguments[i])) {
        for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
          array.push(arguments[i][j]);
      } else {
        array.push(arguments[i]);
      }
    }
    return array;
  };
}
Object.extend(Number.prototype, {
  toColorPart: function() {
    return this.toPaddedString(2, 16);
  },

  succ: function() {
    return this + 1;
  },

  times: function(iterator, context) {
    $R(0, this, true).each(iterator, context);
    return this;
  },

  toPaddedString: function(length, radix) {
    var string = this.toString(radix || 10);
    return '0'.times(length - string.length) + string;
  },

  toJSON: function() {
    return isFinite(this) ? this.toString() : 'null';
  }
});

$w('abs round ceil floor').each(function(method){
  Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
  return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

  function toQueryPair(key, value) {
    if (Object.isUndefined(value)) return key;
    return key + '=' + encodeURIComponent(String.interpret(value));
  }

  return {
    initialize: function(object) {
      this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
    },

    _each: function(iterator) {
      for (var key in this._object) {
        var value = this._object[key], pair = [key, value];
        pair.key = key;
        pair.value = value;
        iterator(pair);
      }
    },

    set: function(key, value) {
      return this._object[key] = value;
    },

    get: function(key) {
      // simulating poorly supported hasOwnProperty
      if (this._object[key] !== Object.prototype[key])
        return this._object[key];
    },

    unset: function(key) {
      var value = this._object[key];
      delete this._object[key];
      return value;
    },

    toObject: function() {
      return Object.clone(this._object);
    },

    keys: function() {
      return this.pluck('key');
    },

    values: function() {
      return this.pluck('value');
    },

    index: function(value) {
      var match = this.detect(function(pair) {
        return pair.value === value;
      });
      return match && match.key;
    },

    merge: function(object) {
      return this.clone().update(object);
    },

    update: function(object) {
      return new Hash(object).inject(this, function(result, pair) {
        result.set(pair.key, pair.value);
        return result;
      });
    },

    toQueryString: function() {
      return this.inject([], function(results, pair) {
        var key = encodeURIComponent(pair.key), values = pair.value;

        if (values && typeof values == 'object') {
          if (Object.isArray(values))
            return results.concat(values.map(toQueryPair.curry(key)));
        } else results.push(toQueryPair(key, values));
        return results;
      }).join('&');
    },

    inspect: function() {
      return '#<Hash:{' + this.map(function(pair) {
        return pair.map(Object.inspect).join(': ');
      }).join(', ') + '}>';
    },

    toJSON: function() {
      return Object.toJSON(this.toObject());
    },

    clone: function() {
      return new Hash(this);
    }
  }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
  initialize: function(start, end, exclusive) {
    this.start = start;
    this.end = end;
    this.exclusive = exclusive;
  },

  _each: function(iterator) {
    var value = this.start;
    while (this.include(value)) {
      iterator(value);
      value = value.succ();
    }
  },

  include: function(value) {
    if (value < this.start)
      return false;
    if (this.exclusive)
      return value < this.end;
    return value <= this.end;
  }
});

var $R = function(start, end, exclusive) {
  return new ObjectRange(start, end, exclusive);
};

var Ajax = {
  getTransport: function() {
    return Try.these(
      function() {return new XMLHttpRequest()},
      function() {return new ActiveXObject('Msxml2.XMLHTTP')},
      function() {return new ActiveXObject('Microsoft.XMLHTTP')}
    ) || false;
  },

  activeRequestCount: 0
};

Ajax.Responders = {
  responders: [],

  _each: function(iterator) {
    this.responders._each(iterator);
  },

  register: function(responder) {
    if (!this.include(responder))
      this.responders.push(responder);
  },

  unregister: function(responder) {
    this.responders = this.responders.without(responder);
  },

  dispatch: function(callback, request, transport, json) {
    this.each(function(responder) {
      if (Object.isFunction(responder[callback])) {
        try {
          responder[callback].apply(responder, [request, transport, json]);
        } catch (e) { }
      }
    });
  }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
  onCreate:   function() { Ajax.activeRequestCount++ },
  onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
  initialize: function(options) {
    this.options = {
      method:       'post',
      asynchronous: true,
      contentType:  'application/x-www-form-urlencoded',
      encoding:     'UTF-8',
      parameters:   '',
      evalJSON:     true,
      evalJS:       true
    };
    Object.extend(this.options, options || { });

    this.options.method = this.options.method.toLowerCase();

    if (Object.isString(this.options.parameters))
      this.options.parameters = this.options.parameters.toQueryParams();
    else if (Object.isHash(this.options.parameters))
      this.options.parameters = this.options.parameters.toObject();
  }
});

Ajax.Request = Class.create(Ajax.Base, {
  _complete: false,

  initialize: function($super, url, options) {
    $super(options);
    this.transport = Ajax.getTransport();
    this.request(url);
  },

  request: function(url) {
    this.url = url;
    this.method = this.options.method;
    var params = Object.clone(this.options.parameters);

    if (!['get', 'post'].include(this.method)) {
      // simulate other verbs over post
      params['_method'] = this.method;
      this.method = 'post';
    }

    this.parameters = params;

    if (params = Object.toQueryString(params)) {
      // when GET, append parameters to URL
      if (this.method == 'get')
        this.url += (this.url.include('?') ? '&' : '?') + params;
      else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
        params += '&_=';
    }

    try {
      var response = new Ajax.Response(this);
      if (this.options.onCreate) this.options.onCreate(response);
      Ajax.Responders.dispatch('onCreate', this, response);

      this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

      if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

      this.transport.onreadystatechange = this.onStateChange.bind(this);
      this.setRequestHeaders();

      this.body = this.method == 'post' ? (this.options.postBody || params) : null;
      this.transport.send(this.body);

      /* Force Firefox to handle ready state 4 for synchronous requests */
      if (!this.options.asynchronous && this.transport.overrideMimeType)
        this.onStateChange();

    }
    catch (e) {
      this.dispatchException(e);
    }
  },

  onStateChange: function() {
    var readyState = this.transport.readyState;
    if (readyState > 1 && !((readyState == 4) && this._complete))
      this.respondToReadyState(this.transport.readyState);
  },

  setRequestHeaders: function() {
    var headers = {
      'X-Requested-With': 'XMLHttpRequest',
      'X-Prototype-Version': Prototype.Version,
      'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
    };

    if (this.method == 'post') {
      headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

      /* Force "Connection: close" for older Mozilla browsers to work
       * around a bug where XMLHttpRequest sends an incorrect
       * Content-length header. See Mozilla Bugzilla #246651.
       */
      if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
            headers['Connection'] = 'close';
    }

    // user-defined headers
    if (typeof this.options.requestHeaders == 'object') {
      var extras = this.options.requestHeaders;

      if (Object.isFunction(extras.push))
        for (var i = 0, length = extras.length; i < length; i += 2)
          headers[extras[i]] = extras[i+1];
      else
        $H(extras).each(function(pair) { headers[pair.key] = pair.value });
    }

    for (var name in headers)
      this.transport.setRequestHeader(name, headers[name]);
  },

  success: function() {
    var status = this.getStatus();
    return !status || (status >= 200 && status < 300);
  },

  getStatus: function() {
    try {
      return this.transport.status || 0;
    } catch (e) { return 0 }
  },

  respondToReadyState: function(readyState) {
    var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

    if (state == 'Complete') {
      try {
        this._complete = true;
        (this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
      } catch (e) {
        this.dispatchException(e);
      }

      var contentType = response.getHeader('Content-type');
      if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
        this.evalResponse();
    }

    try {
      (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
      Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
    } catch (e) {
      this.dispatchException(e);
    }

    if (state == 'Complete') {
      // avoid memory leak in MSIE: clean up
      this.transport.onreadystatechange = Prototype.emptyFunction;
    }
  },

  isSameOrigin: function() {
    var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
    return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
      protocol: location.protocol,
      domain: document.domain,
      port: location.port ? ':' + location.port : ''
    }));
  },

  getHeader: function(name) {
    try {
      return this.transport.getResponseHeader(name) || null;
    } catch (e) { return null }
  },

  evalResponse: function() {
    try {
      return eval((this.transport.responseText || '').unfilterJSON());
    } catch (e) {
      this.dispatchException(e);
    }
  },

  dispatchException: function(exception) {
    (this.options.onException || Prototype.emptyFunction)(this, exception);
    Ajax.Responders.dispatch('onException', this, exception);
  }
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
  initialize: function(request){
    this.request = request;
    var transport  = this.transport  = request.transport,
        readyState = this.readyState = transport.readyState;

    if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
      this.status       = this.getStatus();
      this.statusText   = this.getStatusText();
      this.responseText = String.interpret(transport.responseText);
      this.headerJSON   = this._getHeaderJSON();
    }

    if(readyState == 4) {
      var xml = transport.responseXML;
      this.responseXML  = Object.isUndefined(xml) ? null : xml;
      this.responseJSON = this._getResponseJSON();
    }
  },

  status:      0,
  statusText: '',

  getStatus: Ajax.Request.prototype.getStatus,

  getStatusText: function() {
    try {
      return this.transport.statusText || '';
    } catch (e) { return '' }
  },

  getHeader: Ajax.Request.prototype.getHeader,

  getAllHeaders: function() {
    try {
      return this.getAllResponseHeaders();
    } catch (e) { return null }
  },

  getResponseHeader: function(name) {
    return this.transport.getResponseHeader(name);
  },

  getAllResponseHeaders: function() {
    return this.transport.getAllResponseHeaders();
  },

  _getHeaderJSON: function() {
    var json = this.getHeader('X-JSON');
    if (!json) return null;
    json = decodeURIComponent(escape(json));
    try {
      return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  },

  _getResponseJSON: function() {
    var options = this.request.options;
    if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
          return null;
    try {
      return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
    } catch (e) {
      this.request.dispatchException(e);
    }
  }
});

Ajax.Updater = Class.create(Ajax.Request, {
  initialize: function($super, container, url, options) {
    this.container = {
      success: (container.success || container),
      failure: (container.failure || (container.success ? null : container))
    };

    options = Object.clone(options);
    var onComplete = options.onComplete;
    options.onComplete = (function(response, json) {
      this.updateContent(response.responseText);
      if (Object.isFunction(onComplete)) onComplete(response, json);
    }).bind(this);

    $super(url, options);
  },

  updateContent: function(responseText) {
    var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

    if (!options.evalScripts) responseText = responseText.stripScripts();

    if (receiver = $(receiver)) {
      if (options.insertion) {
        if (Object.isString(options.insertion)) {
          var insertion = { }; insertion[options.insertion] = responseText;
          receiver.insert(insertion);
        }
        else options.insertion(receiver, responseText);
      }
      else receiver.update(responseText);
    }
  }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
  initialize: function($super, container, url, options) {
    $super(options);
    this.onComplete = this.options.onComplete;

    this.frequency = (this.options.frequency || 2);
    this.decay = (this.options.decay || 1);

    this.updater = { };
    this.container = container;
    this.url = url;

    this.start();
  },

  start: function() {
    this.options.onComplete = this.updateComplete.bind(this);
    this.onTimerEvent();
  },

  stop: function() {
    this.updater.options.onComplete = undefined;
    clearTimeout(this.timer);
    (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
  },

  updateComplete: function(response) {
    if (this.options.decay) {
      this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

      this.lastText = response.responseText;
    }
    this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
  },

  onTimerEvent: function() {
    this.updater = new Ajax.Updater(this.container, this.url, this.options);
  }
});
function $(element) {
  if (arguments.length > 1) {
    for (var i = 0, elements = [], length = arguments.length; i < length; i++)
      elements.push($(arguments[i]));
    return elements;
  }
  if (Object.isString(element))
    element = document.getElementById(element);
  return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
  document._getElementsByXPath = function(expression, parentElement) {
    var results = [];
    var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = 0, length = query.snapshotLength; i < length; i++)
      results.push(Element.extend(query.snapshotItem(i)));
    return results;
  };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
  // DOM level 2 ECMAScript Language Binding
  Object.extend(Node, {
    ELEMENT_NODE: 1,
    ATTRIBUTE_NODE: 2,
    TEXT_NODE: 3,
    CDATA_SECTION_NODE: 4,
    ENTITY_REFERENCE_NODE: 5,
    ENTITY_NODE: 6,
    PROCESSING_INSTRUCTION_NODE: 7,
    COMMENT_NODE: 8,
    DOCUMENT_NODE: 9,
    DOCUMENT_TYPE_NODE: 10,
    DOCUMENT_FRAGMENT_NODE: 11,
    NOTATION_NODE: 12
  });
}

(function() {
  var element = this.Element;
  this.Element = function(tagName, attributes) {
    attributes = attributes || { };
    tagName = tagName.toLowerCase();
    var cache = Element.cache;
    if (Prototype.Browser.IE && attributes.name) {
      tagName = '<' + tagName + ' name="' + attributes.name + '">';
      delete attributes.name;
      return Element.writeAttribute(document.createElement(tagName), attributes);
    }
    if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
    return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
  };
  Object.extend(this.Element, element || { });
  if (element) this.Element.prototype = element.prototype;
}).call(window);

Element.cache = { };

Element.Methods = {
  visible: function(element) {
    return $(element).style.display != 'none';
  },

  toggle: function(element) {
    element = $(element);
    Element[Element.visible(element) ? 'hide' : 'show'](element);
    return element;
  },

  hide: function(element) {
    element = $(element);
    element.style.display = 'none';
    return element;
  },

  show: function(element) {
    element = $(element);
    element.style.display = '';
    return element;
  },

  remove: function(element) {
    element = $(element);
    element.parentNode.removeChild(element);
    return element;
  },

  update: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);
    content = Object.toHTML(content);
    element.innerHTML = content.stripScripts();
    content.evalScripts.bind(content).defer();
    return element;
  },

  replace: function(element, content) {
    element = $(element);
    if (content && content.toElement) content = content.toElement();
    else if (!Object.isElement(content)) {
      content = Object.toHTML(content);
      var range = element.ownerDocument.createRange();
      range.selectNode(element);
      content.evalScripts.bind(content).defer();
      content = range.createContextualFragment(content.stripScripts());
    }
    element.parentNode.replaceChild(content, element);
    return element;
  },

  insert: function(element, insertions) {
    element = $(element);

    if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
          insertions = {bottom:insertions};

    var content, insert, tagName, childNodes;

    for (var position in insertions) {
      content  = insertions[position];
      position = position.toLowerCase();
      insert = Element._insertionTranslations[position];

      if (content && content.toElement) content = content.toElement();
      if (Object.isElement(content)) {
        insert(element, content);
        continue;
      }

      content = Object.toHTML(content);

      tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

      childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

      if (position == 'top' || position == 'after') childNodes.reverse();
      childNodes.each(insert.curry(element));

      content.evalScripts.bind(content).defer();
    }

    return element;
  },

  wrap: function(element, wrapper, attributes) {
    element = $(element);
    if (Object.isElement(wrapper))
      $(wrapper).writeAttribute(attributes || { });
    else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
    else wrapper = new Element('div', wrapper);
    if (element.parentNode)
      element.parentNode.replaceChild(wrapper, element);
    wrapper.appendChild(element);
    return wrapper;
  },

  inspect: function(element) {
    element = $(element);
    var result = '<' + element.tagName.toLowerCase();
    $H({'id': 'id', 'className': 'class'}).each(function(pair) {
      var property = pair.first(), attribute = pair.last();
      var value = (element[property] || '').toString();
      if (value) result += ' ' + attribute + '=' + value.inspect(true);
    });
    return result + '>';
  },

  recursivelyCollect: function(element, property) {
    element = $(element);
    var elements = [];
    while (element = element[property])
      if (element.nodeType == 1)
        elements.push(Element.extend(element));
    return elements;
  },

  ancestors: function(element) {
    return $(element).recursivelyCollect('parentNode');
  },

  descendants: function(element) {
    return $(element).select("*");
  },

  firstDescendant: function(element) {
    element = $(element).firstChild;
    while (element && element.nodeType != 1) element = element.nextSibling;
    return $(element);
  },

  immediateDescendants: function(element) {
    if (!(element = $(element).firstChild)) return [];
    while (element && element.nodeType != 1) element = element.nextSibling;
    if (element) return [element].concat($(element).nextSiblings());
    return [];
  },

  previousSiblings: function(element) {
    return $(element).recursivelyCollect('previousSibling');
  },

  nextSiblings: function(element) {
    return $(element).recursivelyCollect('nextSibling');
  },

  siblings: function(element) {
    element = $(element);
    return element.previousSiblings().reverse().concat(element.nextSiblings());
  },

  match: function(element, selector) {
    if (Object.isString(selector))
      selector = new Selector(selector);
    return selector.match($(element));
  },

  up: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(element.parentNode);
    var ancestors = element.ancestors();
    return Object.isNumber(expression) ? ancestors[expression] :
      Selector.findElement(ancestors, expression, index);
  },

  down: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return element.firstDescendant();
    return Object.isNumber(expression) ? element.descendants()[expression] :
      Element.select(element, expression)[index || 0];
  },

  previous: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
    var previousSiblings = element.previousSiblings();
    return Object.isNumber(expression) ? previousSiblings[expression] :
      Selector.findElement(previousSiblings, expression, index);
  },

  next: function(element, expression, index) {
    element = $(element);
    if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
    var nextSiblings = element.nextSiblings();
    return Object.isNumber(expression) ? nextSiblings[expression] :
      Selector.findElement(nextSiblings, expression, index);
  },

  select: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element, args);
  },

  adjacent: function() {
    var args = $A(arguments), element = $(args.shift());
    return Selector.findChildElements(element.parentNode, args).without(element);
  },

  identify: function(element) {
    element = $(element);
    var id = element.readAttribute('id'), self = arguments.callee;
    if (id) return id;
    do { id = 'anonymous_element_' + self.counter++ } while ($(id));
    element.writeAttribute('id', id);
    return id;
  },

  readAttribute: function(element, name) {
    element = $(element);
    if (Prototype.Browser.IE) {
      var t = Element._attributeTranslations.read;
      if (t.values[name]) return t.values[name](element, name);
      if (t.names[name]) name = t.names[name];
      if (name.include(':')) {
        return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
      }
    }
    return element.getAttribute(name);
  },

  writeAttribute: function(element, name, value) {
    element = $(element);
    var attributes = { }, t = Element._attributeTranslations.write;

    if (typeof name == 'object') attributes = name;
    else attributes[name] = Object.isUndefined(value) ? true : value;

    for (var attr in attributes) {
      name = t.names[attr] || attr;
      value = attributes[attr];
      if (t.values[attr]) name = t.values[attr](element, value);
      if (value === false || value === null)
        element.removeAttribute(name);
      else if (value === true)
        element.setAttribute(name, name);
      else element.setAttribute(name, value);
    }
    return element;
  },

  getHeight: function(element) {
    return $(element).getDimensions().height;
  },

  getWidth: function(element) {
    return $(element).getDimensions().width;
  },

  classNames: function(element) {
    return new Element.ClassNames(element);
  },

  hasClassName: function(element, className) {
    if (!(element = $(element))) return;
    var elementClassName = element.className;
    return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
  },

  addClassName: function(element, className) {
    if (!(element = $(element))) return;
    if (!element.hasClassName(className))
      element.className += (element.className ? ' ' : '') + className;
    return element;
  },

  removeClassName: function(element, className) {
    if (!(element = $(element))) return;
    element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
    return element;
  },

  toggleClassName: function(element, className) {
    if (!(element = $(element))) return;
    return element[element.hasClassName(className) ?
      'removeClassName' : 'addClassName'](className);
  },

  // removes whitespace-only text node children
  cleanWhitespace: function(element) {
    element = $(element);
    var node = element.firstChild;
    while (node) {
      var nextNode = node.nextSibling;
      if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
        element.removeChild(node);
      node = nextNode;
    }
    return element;
  },

  empty: function(element) {
    return $(element).innerHTML.blank();
  },

  descendantOf: function(element, ancestor) {
    element = $(element), ancestor = $(ancestor);

    if (element.compareDocumentPosition)
      return (element.compareDocumentPosition(ancestor) & 8) === 8;

    if (ancestor.contains)
      return ancestor.contains(element) && ancestor !== element;

    while (element = element.parentNode)
      if (element == ancestor) return true;

    return false;
  },

  scrollTo: function(element) {
    element = $(element);
    var pos = element.cumulativeOffset();
    window.scrollTo(pos[0], pos[1]);
    return element;
  },

  getStyle: function(element, style) {
    element = $(element);
    style = style == 'float' ? 'cssFloat' : style.camelize();
    var value = element.style[style];
    if (!value || value == 'auto') {
      var css = document.defaultView.getComputedStyle(element, null);
      value = css ? css[style] : null;
    }
    if (style == 'opacity') return value ? parseFloat(value) : 1.0;
    return value == 'auto' ? null : value;
  },

  getOpacity: function(element) {
    return $(element).getStyle('opacity');
  },

  setStyle: function(element, styles) {
    element = $(element);
    var elementStyle = element.style, match;
    if (Object.isString(styles)) {
      element.style.cssText += ';' + styles;
      return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
    }
    for (var property in styles)
      if (property == 'opacity') element.setOpacity(styles[property]);
      else
        elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

    return element;
  },

  setOpacity: function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
    return element;
  },

  getDimensions: function(element) {
    element = $(element);
    var display = element.getStyle('display');
    if (display != 'none' && display != null) // Safari bug
      return {width: element.offsetWidth, height: element.offsetHeight};

    // All *Width and *Height properties give 0 on elements with display none,
    // so enable the element temporarily
    var els = element.style;
    var originalVisibility = els.visibility;
    var originalPosition = els.position;
    var originalDisplay = els.display;
    els.visibility = 'hidden';
    els.position = 'absolute';
    els.display = 'block';
    var originalWidth = element.clientWidth;
    var originalHeight = element.clientHeight;
    els.display = originalDisplay;
    els.position = originalPosition;
    els.visibility = originalVisibility;
    return {width: originalWidth, height: originalHeight};
  },

  makePositioned: function(element) {
    element = $(element);
    var pos = Element.getStyle(element, 'position');
    if (pos == 'static' || !pos) {
      element._madePositioned = true;
      element.style.position = 'relative';
      // Opera returns the offset relative to the positioning context, when an
      // element is position relative but top and left have not been defined
      if (Prototype.Browser.Opera) {
        element.style.top = 0;
        element.style.left = 0;
      }
    }
    return element;
  },

  undoPositioned: function(element) {
    element = $(element);
    if (element._madePositioned) {
      element._madePositioned = undefined;
      element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
    }
    return element;
  },

  makeClipping: function(element) {
    element = $(element);
    if (element._overflow) return element;
    element._overflow = Element.getStyle(element, 'overflow') || 'auto';
    if (element._overflow !== 'hidden')
      element.style.overflow = 'hidden';
    return element;
  },

  undoClipping: function(element) {
    element = $(element);
    if (!element._overflow) return element;
    element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
    element._overflow = null;
    return element;
  },

  cumulativeOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  positionedOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      element = element.offsetParent;
      if (element) {
        if (element.tagName.toUpperCase() == 'BODY') break;
        var p = Element.getStyle(element, 'position');
        if (p !== 'static') break;
      }
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  absolutize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'absolute') return element;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    var offsets = element.positionedOffset();
    var top     = offsets[1];
    var left    = offsets[0];
    var width   = element.clientWidth;
    var height  = element.clientHeight;

    element._originalLeft   = left - parseFloat(element.style.left  || 0);
    element._originalTop    = top  - parseFloat(element.style.top || 0);
    element._originalWidth  = element.style.width;
    element._originalHeight = element.style.height;

    element.style.position = 'absolute';
    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.width  = width + 'px';
    element.style.height = height + 'px';
    return element;
  },

  relativize: function(element) {
    element = $(element);
    if (element.getStyle('position') == 'relative') return element;
    // Position.prepare(); // To be done manually by Scripty when it needs it.

    element.style.position = 'relative';
    var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
    var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

    element.style.top    = top + 'px';
    element.style.left   = left + 'px';
    element.style.height = element._originalHeight;
    element.style.width  = element._originalWidth;
    return element;
  },

  cumulativeScrollOffset: function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.scrollTop  || 0;
      valueL += element.scrollLeft || 0;
      element = element.parentNode;
    } while (element);
    return Element._returnOffset(valueL, valueT);
  },

  getOffsetParent: function(element) {
    if (element.offsetParent) return $(element.offsetParent);
    if (element == document.body) return $(element);

    while ((element = element.parentNode) && element != document.body)
      if (Element.getStyle(element, 'position') != 'static')
        return $(element);

    return $(document.body);
  },

  viewportOffset: function(forElement) {
    var valueT = 0, valueL = 0;

    var element = forElement;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;

      // Safari fix
      if (element.offsetParent == document.body &&
        Element.getStyle(element, 'position') == 'absolute') break;

    } while (element = element.offsetParent);

    element = forElement;
    do {
      if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
        valueT -= element.scrollTop  || 0;
        valueL -= element.scrollLeft || 0;
      }
    } while (element = element.parentNode);

    return Element._returnOffset(valueL, valueT);
  },

  clonePosition: function(element, source) {
    var options = Object.extend({
      setLeft:    true,
      setTop:     true,
      setWidth:   true,
      setHeight:  true,
      offsetTop:  0,
      offsetLeft: 0
    }, arguments[2] || { });

    // find page position of source
    source = $(source);
    var p = source.viewportOffset();

    // find coordinate system to use
    element = $(element);
    var delta = [0, 0];
    var parent = null;
    // delta [0,0] will do fine with position: fixed elements,
    // position:absolute needs offsetParent deltas
    if (Element.getStyle(element, 'position') == 'absolute') {
      parent = element.getOffsetParent();
      delta = parent.viewportOffset();
    }

    // correct by body offsets (fixes Safari)
    if (parent == document.body) {
      delta[0] -= document.body.offsetLeft;
      delta[1] -= document.body.offsetTop;
    }

    // set position
    if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
    if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
    if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
    if (options.setHeight) element.style.height = source.offsetHeight + 'px';
    return element;
  }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
  getElementsBySelector: Element.Methods.select,
  childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
  write: {
    names: {
      className: 'class',
      htmlFor:   'for'
    },
    values: { }
  }
};

if (Prototype.Browser.Opera) {
  Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function(proceed, element, style) {
      switch (style) {
        case 'left': case 'top': case 'right': case 'bottom':
          if (proceed(element, 'position') === 'static') return null;
        case 'height': case 'width':
          // returns '0px' for hidden elements; we want it to return null
          if (!Element.visible(element)) return null;

          // returns the border-box dimensions rather than the content-box
          // dimensions, so we subtract padding and borders from the value
          var dim = parseInt(proceed(element, style), 10);

          if (dim !== element['offset' + style.capitalize()])
            return dim + 'px';

          var properties;
          if (style === 'height') {
            properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
          }
          else {
            properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
          }
          return properties.inject(dim, function(memo, property) {
            var val = proceed(element, property);
            return val === null ? memo : memo - parseInt(val, 10);
          }) + 'px';
        default: return proceed(element, style);
      }
    }
  );

  Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function(proceed, element, attribute) {
      if (attribute === 'title') return element.title;
      return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
  // IE doesn't report offsets correctly for static elements, so we change them
  // to "relative" to get the values, then change them back.
  Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
    function(proceed, element) {
      element = $(element);
      // IE throws an error if element is not in document
      try { element.offsetParent }
      catch(e) { return $(document.body) }
      var position = element.getStyle('position');
      if (position !== 'static') return proceed(element);
      element.setStyle({ position: 'relative' });
      var value = proceed(element);
      element.setStyle({ position: position });
      return value;
    }
  );

  $w('positionedOffset viewportOffset').each(function(method) {
    Element.Methods[method] = Element.Methods[method].wrap(
      function(proceed, element) {
        element = $(element);
        try { element.offsetParent }
        catch(e) { return Element._returnOffset(0,0) }
        var position = element.getStyle('position');
        if (position !== 'static') return proceed(element);
        // Trigger hasLayout on the offset parent so that IE6 reports
        // accurate offsetTop and offsetLeft values for position: fixed.
        var offsetParent = element.getOffsetParent();
        if (offsetParent && offsetParent.getStyle('position') === 'fixed')
          offsetParent.setStyle({ zoom: 1 });
        element.setStyle({ position: 'relative' });
        var value = proceed(element);
        element.setStyle({ position: position });
        return value;
      }
    );
  });

  Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
    function(proceed, element) {
      try { element.offsetParent }
      catch(e) { return Element._returnOffset(0,0) }
      return proceed(element);
    }
  );

  Element.Methods.getStyle = function(element, style) {
    element = $(element);
    style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
    var value = element.style[style];
    if (!value && element.currentStyle) value = element.currentStyle[style];

    if (style == 'opacity') {
      if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
        if (value[1]) return parseFloat(value[1]) / 100;
      return 1.0;
    }

    if (value == 'auto') {
      if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
        return element['offset' + style.capitalize()] + 'px';
      return null;
    }
    return value;
  };

  Element.Methods.setOpacity = function(element, value) {
    function stripAlpha(filter){
      return filter.replace(/alpha\([^\)]*\)/gi,'');
    }
    element = $(element);
    var currentStyle = element.currentStyle;
    if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
        element.style.zoom = 1;

    var filter = element.getStyle('filter'), style = element.style;
    if (value == 1 || value === '') {
      (filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
      return element;
    } else if (value < 0.00001) value = 0;
    style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
    return element;
  };

  Element._attributeTranslations = {
    read: {
      names: {
        'class': 'className',
        'for':   'htmlFor'
      },
      values: {
        _getAttr: function(element, attribute) {
          return element.getAttribute(attribute, 2);
        },
        _getAttrNode: function(element, attribute) {
          var node = element.getAttributeNode(attribute);
          return node ? node.value : "";
        },
        _getEv: function(element, attribute) {
          attribute = element.getAttribute(attribute);
          return attribute ? attribute.toString().slice(23, -2) : null;
        },
        _flag: function(element, attribute) {
          return $(element).hasAttribute(attribute) ? attribute : null;
        },
        style: function(element) {
          return element.style.cssText.toLowerCase();
        },
        title: function(element) {
          return element.title;
        }
      }
    }
  };

  Element._attributeTranslations.write = {
    names: Object.extend({
      cellpadding: 'cellPadding',
      cellspacing: 'cellSpacing'
    }, Element._attributeTranslations.read.names),
    values: {
      checked: function(element, value) {
        element.checked = !!value;
      },

      style: function(element, value) {
        element.style.cssText = value ? value : '';
      }
    }
  };

  Element._attributeTranslations.has = {};

  $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
    Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
    Element._attributeTranslations.has[attr.toLowerCase()] = attr;
  });

  (function(v) {
    Object.extend(v, {
      href:        v._getAttr,
      src:         v._getAttr,
      type:        v._getAttr,
      action:      v._getAttrNode,
      disabled:    v._flag,
      checked:     v._flag,
      readonly:    v._flag,
      multiple:    v._flag,
      onload:      v._getEv,
      onunload:    v._getEv,
      onclick:     v._getEv,
      ondblclick:  v._getEv,
      onmousedown: v._getEv,
      onmouseup:   v._getEv,
      onmouseover: v._getEv,
      onmousemove: v._getEv,
      onmouseout:  v._getEv,
      onfocus:     v._getEv,
      onblur:      v._getEv,
      onkeypress:  v._getEv,
      onkeydown:   v._getEv,
      onkeyup:     v._getEv,
      onsubmit:    v._getEv,
      onreset:     v._getEv,
      onselect:    v._getEv,
      onchange:    v._getEv
    });
  })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
    return element;
  };
}

else if (Prototype.Browser.WebKit) {
  Element.Methods.setOpacity = function(element, value) {
    element = $(element);
    element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

    if (value == 1)
      if(element.tagName.toUpperCase() == 'IMG' && element.width) {
        element.width++; element.width--;
      } else try {
        var n = document.createTextNode(' ');
        element.appendChild(n);
        element.removeChild(n);
      } catch (e) { }

    return element;
  };

  // Safari returns margins on body which is incorrect if the child is absolutely
  // positioned.  For performance reasons, redefine Element#cumulativeOffset for
  // KHTML/WebKit only.
  Element.Methods.cumulativeOffset = function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      if (element.offsetParent == document.body)
        if (Element.getStyle(element, 'position') == 'absolute') break;

      element = element.offsetParent;
    } while (element);

    return Element._returnOffset(valueL, valueT);
  };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
  // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
  Element.Methods.update = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) return element.update().insert(content);

    content = Object.toHTML(content);
    var tagName = element.tagName.toUpperCase();

    if (tagName in Element._insertionTranslations.tags) {
      $A(element.childNodes).each(function(node) { element.removeChild(node) });
      Element._getContentFromAnonymousElement(tagName, content.stripScripts())
        .each(function(node) { element.appendChild(node) });
    }
    else element.innerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

if ('outerHTML' in document.createElement('div')) {
  Element.Methods.replace = function(element, content) {
    element = $(element);

    if (content && content.toElement) content = content.toElement();
    if (Object.isElement(content)) {
      element.parentNode.replaceChild(content, element);
      return element;
    }

    content = Object.toHTML(content);
    var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

    if (Element._insertionTranslations.tags[tagName]) {
      var nextSibling = element.next();
      var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
      parent.removeChild(element);
      if (nextSibling)
        fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
      else
        fragments.each(function(node) { parent.appendChild(node) });
    }
    else element.outerHTML = content.stripScripts();

    content.evalScripts.bind(content).defer();
    return element;
  };
}

Element._returnOffset = function(l, t) {
  var result = [l, t];
  result.left = l;
  result.top = t;
  return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
  var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
  if (t) {
    div.innerHTML = t[0] + html + t[1];
    t[2].times(function() { div = div.firstChild });
  } else div.innerHTML = html;
  return $A(div.childNodes);
};

Element._insertionTranslations = {
  before: function(element, node) {
    element.parentNode.insertBefore(node, element);
  },
  top: function(element, node) {
    element.insertBefore(node, element.firstChild);
  },
  bottom: function(element, node) {
    element.appendChild(node);
  },
  after: function(element, node) {
    element.parentNode.insertBefore(node, element.nextSibling);
  },
  tags: {
    TABLE:  ['<table>',                '</table>',                   1],
    TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
    TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
    TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
    SELECT: ['<select>',               '</select>',                  1]
  }
};

(function() {
  Object.extend(this.tags, {
    THEAD: this.tags.TBODY,
    TFOOT: this.tags.TBODY,
    TH:    this.tags.TD
  });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
  hasAttribute: function(element, attribute) {
    attribute = Element._attributeTranslations.has[attribute] || attribute;
    var node = $(element).getAttributeNode(attribute);
    return !!(node && node.specified);
  }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
    document.createElement('div')['__proto__']) {
  window.HTMLElement = { };
  window.HTMLElement.prototype = document.createElement('div')['__proto__'];
  Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
  if (Prototype.BrowserFeatures.SpecificElementExtensions)
    return Prototype.K;

  var Methods = { }, ByTag = Element.Methods.ByTag;

  var extend = Object.extend(function(element) {
    if (!element || element._extendedByPrototype ||
        element.nodeType != 1 || element == window) return element;

    var methods = Object.clone(Methods),
      tagName = element.tagName.toUpperCase(), property, value;

    // extend methods for specific tags
    if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

    for (property in methods) {
      value = methods[property];
      if (Object.isFunction(value) && !(property in element))
        element[property] = value.methodize();
    }

    element._extendedByPrototype = Prototype.emptyFunction;
    return element;

  }, {
    refresh: function() {
      // extend methods for all tags (Safari doesn't need this)
      if (!Prototype.BrowserFeatures.ElementExtensions) {
        Object.extend(Methods, Element.Methods);
        Object.extend(Methods, Element.Methods.Simulated);
      }
    }
  });

  extend.refresh();
  return extend;
})();

Element.hasAttribute = function(element, attribute) {
  if (element.hasAttribute) return element.hasAttribute(attribute);
  return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
  var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

  if (!methods) {
    Object.extend(Form, Form.Methods);
    Object.extend(Form.Element, Form.Element.Methods);
    Object.extend(Element.Methods.ByTag, {
      "FORM":     Object.clone(Form.Methods),
      "INPUT":    Object.clone(Form.Element.Methods),
      "SELECT":   Object.clone(Form.Element.Methods),
      "TEXTAREA": Object.clone(Form.Element.Methods)
    });
  }

  if (arguments.length == 2) {
    var tagName = methods;
    methods = arguments[1];
  }

  if (!tagName) Object.extend(Element.Methods, methods || { });
  else {
    if (Object.isArray(tagName)) tagName.each(extend);
    else extend(tagName);
  }

  function extend(tagName) {
    tagName = tagName.toUpperCase();
    if (!Element.Methods.ByTag[tagName])
      Element.Methods.ByTag[tagName] = { };
    Object.extend(Element.Methods.ByTag[tagName], methods);
  }

  function copy(methods, destination, onlyIfAbsent) {
    onlyIfAbsent = onlyIfAbsent || false;
    for (var property in methods) {
      var value = methods[property];
      if (!Object.isFunction(value)) continue;
      if (!onlyIfAbsent || !(property in destination))
        destination[property] = value.methodize();
    }
  }

  function findDOMClass(tagName) {
    var klass;
    var trans = {
      "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
      "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
      "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
      "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
      "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
    };
    if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName + 'Element';
    if (window[klass]) return window[klass];
    klass = 'HTML' + tagName.capitalize() + 'Element';
    if (window[klass]) return window[klass];

    window[klass] = { };
    window[klass].prototype = document.createElement(tagName)['__proto__'];
    return window[klass];
  }

  if (F.ElementExtensions) {
    copy(Element.Methods, HTMLElement.prototype);
    copy(Element.Methods.Simulated, HTMLElement.prototype, true);
  }

  if (F.SpecificElementExtensions) {
    for (var tag in Element.Methods.ByTag) {
      var klass = findDOMClass(tag);
      if (Object.isUndefined(klass)) continue;
      copy(T[tag], klass.prototype);
    }
  }

  Object.extend(Element, Element.Methods);
  delete Element.ByTag;

  if (Element.extend.refresh) Element.extend.refresh();
  Element.cache = { };
};

document.viewport = {
  getDimensions: function() {
    var dimensions = { }, B = Prototype.Browser;
    $w('width height').each(function(d) {
      var D = d.capitalize();
      if (B.WebKit && !document.evaluate) {
        // Safari <3.0 needs self.innerWidth/Height
        dimensions[d] = self['inner' + D];
      } else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
        // Opera <9.5 needs document.body.clientWidth/Height
        dimensions[d] = document.body['client' + D]
      } else {
        dimensions[d] = document.documentElement['client' + D];
      }
    });
    return dimensions;
  },

  getWidth: function() {
    return this.getDimensions().width;
  },

  getHeight: function() {
    return this.getDimensions().height;
  },

  getScrollOffsets: function() {
    return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
  }
};
/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
 * part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
 * license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
  initialize: function(expression) {
    this.expression = expression.strip();

    if (this.shouldUseSelectorsAPI()) {
      this.mode = 'selectorsAPI';
    } else if (this.shouldUseXPath()) {
      this.mode = 'xpath';
      this.compileXPathMatcher();
    } else {
      this.mode = "normal";
      this.compileMatcher();
    }

  },

  shouldUseXPath: function() {
    if (!Prototype.BrowserFeatures.XPath) return false;

    var e = this.expression;

    // Safari 3 chokes on :*-of-type and :empty
    if (Prototype.Browser.WebKit &&
     (e.include("-of-type") || e.include(":empty")))
      return false;

    // XPath can't do namespaced attributes, nor can it read
    // the "checked" property from DOM nodes
    if ((/(\[[\w-]*?:|:checked)/).test(e))
      return false;

    return true;
  },

  shouldUseSelectorsAPI: function() {
    if (!Prototype.BrowserFeatures.SelectorsAPI) return false;

    if (!Selector._div) Selector._div = new Element('div');

    // Make sure the browser treats the selector as valid. Test on an
    // isolated element to minimize cost of this check.
    try {
      Selector._div.querySelector(this.expression);
    } catch(e) {
      return false;
    }

    return true;
  },

  compileMatcher: function() {
    var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
        c = Selector.criteria, le, p, m;

    if (Selector._cache[e]) {
      this.matcher = Selector._cache[e];
      return;
    }

    this.matcher = ["this.matcher = function(root) {",
                    "var r = root, h = Selector.handlers, c = false, n;"];

    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
            new Template(c[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.matcher.push("return h.unique(n);\n}");
    eval(this.matcher.join('\n'));
    Selector._cache[this.expression] = this.matcher;
  },

  compileXPathMatcher: function() {
    var e = this.expression, ps = Selector.patterns,
        x = Selector.xpath, le, m;

    if (Selector._cache[e]) {
      this.xpath = Selector._cache[e]; return;
    }

    this.matcher = ['.//*'];
    while (e && le != e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        if (m = e.match(ps[i])) {
          this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
            new Template(x[i]).evaluate(m));
          e = e.replace(m[0], '');
          break;
        }
      }
    }

    this.xpath = this.matcher.join('');
    Selector._cache[this.expression] = this.xpath;
  },

  findElements: function(root) {
    root = root || document;
    var e = this.expression, results;

    switch (this.mode) {
      case 'selectorsAPI':
        // querySelectorAll queries document-wide, then filters to descendants
        // of the context element. That's not what we want.
        // Add an explicit context to the selector if necessary.
        if (root !== document) {
          var oldId = root.id, id = $(root).identify();
          e = "#" + id + " " + e;
        }

        results = $A(root.querySelectorAll(e)).map(Element.extend);
        root.id = oldId;

        return results;
      case 'xpath':
        return document._getElementsByXPath(this.xpath, root);
      default:
       return this.matcher(root);
    }
  },

  match: function(element) {
    this.tokens = [];

    var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
    var le, p, m;

    while (e && le !== e && (/\S/).test(e)) {
      le = e;
      for (var i in ps) {
        p = ps[i];
        if (m = e.match(p)) {
          // use the Selector.assertions methods unless the selector
          // is too complex.
          if (as[i]) {
            this.tokens.push([i, Object.clone(m)]);
            e = e.replace(m[0], '');
          } else {
            // reluctantly do a document-wide search
            // and look for a match in the array
            return this.findElements(document).include(element);
          }
        }
      }
    }

    var match = true, name, matches;
    for (var i = 0, token; token = this.tokens[i]; i++) {
      name = token[0], matches = token[1];
      if (!Selector.assertions[name](element, matches)) {
        match = false; break;
      }
    }

    return match;
  },

  toString: function() {
    return this.expression;
  },

  inspect: function() {
    return "#<Selector:" + this.expression.inspect() + ">";
  }
});

Object.extend(Selector, {
  _cache: { },

  xpath: {
    descendant:   "//*",
    child:        "/*",
    adjacent:     "/following-sibling::*[1]",
    laterSibling: '/following-sibling::*',
    tagName:      function(m) {
      if (m[1] == '*') return '';
      return "[local-name()='" + m[1].toLowerCase() +
             "' or local-name()='" + m[1].toUpperCase() + "']";
    },
    className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
    id:           "[@id='#{1}']",
    attrPresence: function(m) {
      m[1] = m[1].toLowerCase();
      return new Template("[@#{1}]").evaluate(m);
    },
    attr: function(m) {
      m[1] = m[1].toLowerCase();
      m[3] = m[5] || m[6];
      return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
    },
    pseudo: function(m) {
      var h = Selector.xpath.pseudos[m[1]];
      if (!h) return '';
      if (Object.isFunction(h)) return h(m);
      return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
    },
    operators: {
      '=':  "[@#{1}='#{3}']",
      '!=': "[@#{1}!='#{3}']",
      '^=': "[starts-with(@#{1}, '#{3}')]",
      '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
      '*=': "[contains(@#{1}, '#{3}')]",
      '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
      '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
    },
    pseudos: {
      'first-child': '[not(preceding-sibling::*)]',
      'last-child':  '[not(following-sibling::*)]',
      'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
      'empty':       "[count(*) = 0 and (count(text()) = 0)]",
      'checked':     "[@checked]",
      'disabled':    "[(@disabled) and (@type!='hidden')]",
      'enabled':     "[not(@disabled) and (@type!='hidden')]",
      'not': function(m) {
        var e = m[6], p = Selector.patterns,
            x = Selector.xpath, le, v;

        var exclusion = [];
        while (e && le != e && (/\S/).test(e)) {
          le = e;
          for (var i in p) {
            if (m = e.match(p[i])) {
              v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
              exclusion.push("(" + v.substring(1, v.length - 1) + ")");
              e = e.replace(m[0], '');
              break;
            }
          }
        }
        return "[not(" + exclusion.join(" and ") + ")]";
      },
      'nth-child':      function(m) {
        return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
      },
      'nth-last-child': function(m) {
        return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
      },
      'nth-of-type':    function(m) {
        return Selector.xpath.pseudos.nth("position() ", m);
      },
      'nth-last-of-type': function(m) {
        return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
      },
      'first-of-type':  function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
      },
      'last-of-type':   function(m) {
        m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
      },
      'only-of-type':   function(m) {
        var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
      },
      nth: function(fragment, m) {
        var mm, formula = m[6], predicate;
        if (formula == 'even') formula = '2n+0';
        if (formula == 'odd')  formula = '2n+1';
        if (mm = formula.match(/^(\d+)$/)) // digit only
          return '[' + fragment + "= " + mm[1] + ']';
        if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
          if (mm[1] == "-") mm[1] = -1;
          var a = mm[1] ? Number(mm[1]) : 1;
          var b = mm[2] ? Number(mm[2]) : 0;
          predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
          "((#{fragment} - #{b}) div #{a} >= 0)]";
          return new Template(predicate).evaluate({
            fragment: fragment, a: a, b: b });
        }
      }
    }
  },

  criteria: {
    tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
    className:    'n = h.className(n, r, "#{1}", c);    c = false;',
    id:           'n = h.id(n, r, "#{1}", c);           c = false;',
    attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
    attr: function(m) {
      m[3] = (m[5] || m[6]);
      return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
    },
    pseudo: function(m) {
      if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
      return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
    },
    descendant:   'c = "descendant";',
    child:        'c = "child";',
    adjacent:     'c = "adjacent";',
    laterSibling: 'c = "laterSibling";'
  },

  patterns: {
    // combinators must be listed first
    // (and descendant needs to be last combinator)
    laterSibling: /^\s*~\s*/,
    child:        /^\s*>\s*/,
    adjacent:     /^\s*\+\s*/,
    descendant:   /^\s/,

    // selectors follow
    tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
    id:           /^#([\w\-\*]+)(\b|$)/,
    className:    /^\.([\w\-\*]+)(\b|$)/,
    pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
    attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
    attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
  },

  // for Selector.match and Element#match
  assertions: {
    tagName: function(element, matches) {
      return matches[1].toUpperCase() == element.tagName.toUpperCase();
    },

    className: function(element, matches) {
      return Element.hasClassName(element, matches[1]);
    },

    id: function(element, matches) {
      return element.id === matches[1];
    },

    attrPresence: function(element, matches) {
      return Element.hasAttribute(element, matches[1]);
    },

    attr: function(element, matches) {
      var nodeValue = Element.readAttribute(element, matches[1]);
      return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
    }
  },

  handlers: {
    // UTILITY FUNCTIONS
    // joins two collections
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        a.push(node);
      return a;
    },

    // marks an array of nodes for counting
    mark: function(nodes) {
      var _true = Prototype.emptyFunction;
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = _true;
      return nodes;
    },

    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node._countedByPrototype = undefined;
      return nodes;
    },

    // mark each child node with its position (for nth calls)
    // "ofType" flag indicates whether we're indexing for nth-of-type
    // rather than nth-child
    index: function(parentNode, reverse, ofType) {
      parentNode._countedByPrototype = Prototype.emptyFunction;
      if (reverse) {
        for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
          var node = nodes[i];
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
        }
      } else {
        for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
          if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
      }
    },

    // filters out duplicates and extends all nodes
    unique: function(nodes) {
      if (nodes.length == 0) return nodes;
      var results = [], n;
      for (var i = 0, l = nodes.length; i < l; i++)
        if (!(n = nodes[i])._countedByPrototype) {
          n._countedByPrototype = Prototype.emptyFunction;
          results.push(Element.extend(n));
        }
      return Selector.handlers.unmark(results);
    },

    // COMBINATOR FUNCTIONS
    descendant: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, node.getElementsByTagName('*'));
      return results;
    },

    child: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        for (var j = 0, child; child = node.childNodes[j]; j++)
          if (child.nodeType == 1 && child.tagName != '!') results.push(child);
      }
      return results;
    },

    adjacent: function(nodes) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        var next = this.nextElementSibling(node);
        if (next) results.push(next);
      }
      return results;
    },

    laterSibling: function(nodes) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        h.concat(results, Element.nextSiblings(node));
      return results;
    },

    nextElementSibling: function(node) {
      while (node = node.nextSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    previousElementSibling: function(node) {
      while (node = node.previousSibling)
        if (node.nodeType == 1) return node;
      return null;
    },

    // TOKEN FUNCTIONS
    tagName: function(nodes, root, tagName, combinator) {
      var uTagName = tagName.toUpperCase();
      var results = [], h = Selector.handlers;
      if (nodes) {
        if (combinator) {
          // fastlane for ordinary descendant combinators
          if (combinator == "descendant") {
            for (var i = 0, node; node = nodes[i]; i++)
              h.concat(results, node.getElementsByTagName(tagName));
            return results;
          } else nodes = this[combinator](nodes);
          if (tagName == "*") return nodes;
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.tagName.toUpperCase() === uTagName) results.push(node);
        return results;
      } else return root.getElementsByTagName(tagName);
    },

    id: function(nodes, root, id, combinator) {
      var targetNode = $(id), h = Selector.handlers;
      if (!targetNode) return [];
      if (!nodes && root == document) return [targetNode];
      if (nodes) {
        if (combinator) {
          if (combinator == 'child') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (targetNode.parentNode == node) return [targetNode];
          } else if (combinator == 'descendant') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Element.descendantOf(targetNode, node)) return [targetNode];
          } else if (combinator == 'adjacent') {
            for (var i = 0, node; node = nodes[i]; i++)
              if (Selector.handlers.previousElementSibling(targetNode) == node)
                return [targetNode];
          } else nodes = h[combinator](nodes);
        }
        for (var i = 0, node; node = nodes[i]; i++)
          if (node == targetNode) return [targetNode];
        return [];
      }
      return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
    },

    className: function(nodes, root, className, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      return Selector.handlers.byClassName(nodes, root, className);
    },

    byClassName: function(nodes, root, className) {
      if (!nodes) nodes = Selector.handlers.descendant([root]);
      var needle = ' ' + className + ' ';
      for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
        nodeClassName = node.className;
        if (nodeClassName.length == 0) continue;
        if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
          results.push(node);
      }
      return results;
    },

    attrPresence: function(nodes, root, attr, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var results = [];
      for (var i = 0, node; node = nodes[i]; i++)
        if (Element.hasAttribute(node, attr)) results.push(node);
      return results;
    },

    attr: function(nodes, root, attr, value, operator, combinator) {
      if (!nodes) nodes = root.getElementsByTagName("*");
      if (nodes && combinator) nodes = this[combinator](nodes);
      var handler = Selector.operators[operator], results = [];
      for (var i = 0, node; node = nodes[i]; i++) {
        var nodeValue = Element.readAttribute(node, attr);
        if (nodeValue === null) continue;
        if (handler(nodeValue, value)) results.push(node);
      }
      return results;
    },

    pseudo: function(nodes, name, value, root, combinator) {
      if (nodes && combinator) nodes = this[combinator](nodes);
      if (!nodes) nodes = root.getElementsByTagName("*");
      return Selector.pseudos[name](nodes, value, root);
    }
  },

  pseudos: {
    'first-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.previousElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'last-child': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        if (Selector.handlers.nextElementSibling(node)) continue;
          results.push(node);
      }
      return results;
    },
    'only-child': function(nodes, value, root) {
      var h = Selector.handlers;
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
          results.push(node);
      return results;
    },
    'nth-child':        function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root);
    },
    'nth-last-child':   function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true);
    },
    'nth-of-type':      function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, false, true);
    },
    'nth-last-of-type': function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, formula, root, true, true);
    },
    'first-of-type':    function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, false, true);
    },
    'last-of-type':     function(nodes, formula, root) {
      return Selector.pseudos.nth(nodes, "1", root, true, true);
    },
    'only-of-type':     function(nodes, formula, root) {
      var p = Selector.pseudos;
      return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
    },

    // handles the an+b logic
    getIndices: function(a, b, total) {
      if (a == 0) return b > 0 ? [b] : [];
      return $R(1, total).inject([], function(memo, i) {
        if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
        return memo;
      });
    },

    // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
    nth: function(nodes, formula, root, reverse, ofType) {
      if (nodes.length == 0) return [];
      if (formula == 'even') formula = '2n+0';
      if (formula == 'odd')  formula = '2n+1';
      var h = Selector.handlers, results = [], indexed = [], m;
      h.mark(nodes);
      for (var i = 0, node; node = nodes[i]; i++) {
        if (!node.parentNode._countedByPrototype) {
          h.index(node.parentNode, reverse, ofType);
          indexed.push(node.parentNode);
        }
      }
      if (formula.match(/^\d+$/)) { // just a number
        formula = Number(formula);
        for (var i = 0, node; node = nodes[i]; i++)
          if (node.nodeIndex == formula) results.push(node);
      } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
        if (m[1] == "-") m[1] = -1;
        var a = m[1] ? Number(m[1]) : 1;
        var b = m[2] ? Number(m[2]) : 0;
        var indices = Selector.pseudos.getIndices(a, b, nodes.length);
        for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
          for (var j = 0; j < l; j++)
            if (node.nodeIndex == indices[j]) results.push(node);
        }
      }
      h.unmark(nodes);
      h.unmark(indexed);
      return results;
    },

    'empty': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++) {
        // IE treats comments as element nodes
        if (node.tagName == '!' || node.firstChild) continue;
        results.push(node);
      }
      return results;
    },

    'not': function(nodes, selector, root) {
      var h = Selector.handlers, selectorType, m;
      var exclusions = new Selector(selector).findElements(root);
      h.mark(exclusions);
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node._countedByPrototype) results.push(node);
      h.unmark(exclusions);
      return results;
    },

    'enabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (!node.disabled && (!node.type || node.type !== 'hidden'))
          results.push(node);
      return results;
    },

    'disabled': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.disabled) results.push(node);
      return results;
    },

    'checked': function(nodes, value, root) {
      for (var i = 0, results = [], node; node = nodes[i]; i++)
        if (node.checked) results.push(node);
      return results;
    }
  },

  operators: {
    '=':  function(nv, v) { return nv == v; },
    '!=': function(nv, v) { return nv != v; },
    '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
    '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
    '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
    '$=': function(nv, v) { return nv.endsWith(v); },
    '*=': function(nv, v) { return nv.include(v); },
    '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
    '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
     '-').include('-' + (v || "").toUpperCase() + '-'); }
  },

  split: function(expression) {
    var expressions = [];
    expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
      expressions.push(m[1].strip());
    });
    return expressions;
  },

  matchElements: function(elements, expression) {
    var matches = $$(expression), h = Selector.handlers;
    h.mark(matches);
    for (var i = 0, results = [], element; element = elements[i]; i++)
      if (element._countedByPrototype) results.push(element);
    h.unmark(matches);
    return results;
  },

  findElement: function(elements, expression, index) {
    if (Object.isNumber(expression)) {
      index = expression; expression = false;
    }
    return Selector.matchElements(elements, expression || '*')[index || 0];
  },

  findChildElements: function(element, expressions) {
    expressions = Selector.split(expressions.join(','));
    var results = [], h = Selector.handlers;
    for (var i = 0, l = expressions.length, selector; i < l; i++) {
      selector = new Selector(expressions[i].strip());
      h.concat(results, selector.findElements(element));
    }
    return (l > 1) ? h.unique(results) : results;
  }
});

if (Prototype.Browser.IE) {
  Object.extend(Selector.handlers, {
    // IE returns comment nodes on getElementsByTagName("*").
    // Filter them out.
    concat: function(a, b) {
      for (var i = 0, node; node = b[i]; i++)
        if (node.tagName !== "!") a.push(node);
      return a;
    },

    // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
    unmark: function(nodes) {
      for (var i = 0, node; node = nodes[i]; i++)
        node.removeAttribute('_countedByPrototype');
      return nodes;
    }
  });
}

function $$() {
  return Selector.findChildElements(document, $A(arguments));
}
var Form = {
  reset: function(form) {
    $(form).reset();
    return form;
  },

  serializeElements: function(elements, options) {
    if (typeof options != 'object') options = { hash: !!options };
    else if (Object.isUndefined(options.hash)) options.hash = true;
    var key, value, submitted = false, submit = options.submit;

    var data = elements.inject({ }, function(result, element) {
      if (!element.disabled && element.name) {
        key = element.name; value = $(element).getValue();
        if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
          if (key in result) {
            // a key is already present; construct an array of values
            if (!Object.isArray(result[key])) result[key] = [result[key]];
            result[key].push(value);
          }
          else result[key] = value;
        }
      }
      return result;
    });

    return options.hash ? data : Object.toQueryString(data);
  }
};

Form.Methods = {
  serialize: function(form, options) {
    return Form.serializeElements(Form.getElements(form), options);
  },

  getElements: function(form) {
    return $A($(form).getElementsByTagName('*')).inject([],
      function(elements, child) {
        if (Form.Element.Serializers[child.tagName.toLowerCase()])
          elements.push(Element.extend(child));
        return elements;
      }
    );
  },

  getInputs: function(form, typeName, name) {
    form = $(form);
    var inputs = form.getElementsByTagName('input');

    if (!typeName && !name) return $A(inputs).map(Element.extend);

    for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
      var input = inputs[i];
      if ((typeName && input.type != typeName) || (name && input.name != name))
        continue;
      matchingInputs.push(Element.extend(input));
    }

    return matchingInputs;
  },

  disable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('disable');
    return form;
  },

  enable: function(form) {
    form = $(form);
    Form.getElements(form).invoke('enable');
    return form;
  },

  findFirstElement: function(form) {
    var elements = $(form).getElements().findAll(function(element) {
      return 'hidden' != element.type && !element.disabled;
    });
    var firstByIndex = elements.findAll(function(element) {
      return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
    }).sortBy(function(element) { return element.tabIndex }).first();

    return firstByIndex ? firstByIndex : elements.find(function(element) {
      return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
    });
  },

  focusFirstElement: function(form) {
    form = $(form);
    form.findFirstElement().activate();
    return form;
  },

  request: function(form, options) {
    form = $(form), options = Object.clone(options || { });

    var params = options.parameters, action = form.readAttribute('action') || '';
    if (action.blank()) action = window.location.href;
    options.parameters = form.serialize(true);

    if (params) {
      if (Object.isString(params)) params = params.toQueryParams();
      Object.extend(options.parameters, params);
    }

    if (form.hasAttribute('method') && !options.method)
      options.method = form.method;

    return new Ajax.Request(action, options);
  }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
  focus: function(element) {
    $(element).focus();
    return element;
  },

  select: function(element) {
    $(element).select();
    return element;
  }
};

Form.Element.Methods = {
  serialize: function(element) {
    element = $(element);
    if (!element.disabled && element.name) {
      var value = element.getValue();
      if (value != undefined) {
        var pair = { };
        pair[element.name] = value;
        return Object.toQueryString(pair);
      }
    }
    return '';
  },

  getValue: function(element) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    return Form.Element.Serializers[method](element);
  },

  setValue: function(element, value) {
    element = $(element);
    var method = element.tagName.toLowerCase();
    Form.Element.Serializers[method](element, value);
    return element;
  },

  clear: function(element) {
    $(element).value = '';
    return element;
  },

  present: function(element) {
    return $(element).value != '';
  },

  activate: function(element) {
    element = $(element);
    try {
      element.focus();
      if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !['button', 'reset', 'submit'].include(element.type)))
        element.select();
    } catch (e) { }
    return element;
  },

  disable: function(element) {
    element = $(element);
    element.disabled = true;
    return element;
  },

  enable: function(element) {
    element = $(element);
    element.disabled = false;
    return element;
  }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
  input: function(element, value) {
    switch (element.type.toLowerCase()) {
      case 'checkbox':
      case 'radio':
        return Form.Element.Serializers.inputSelector(element, value);
      default:
        return Form.Element.Serializers.textarea(element, value);
    }
  },

  inputSelector: function(element, value) {
    if (Object.isUndefined(value)) return element.checked ? element.value : null;
    else element.checked = !!value;
  },

  textarea: function(element, value) {
    if (Object.isUndefined(value)) return element.value;
    else element.value = value;
  },

  select: function(element, value) {
    if (Object.isUndefined(value))
      return this[element.type == 'select-one' ?
        'selectOne' : 'selectMany'](element);
    else {
      var opt, currentValue, single = !Object.isArray(value);
      for (var i = 0, length = element.length; i < length; i++) {
        opt = element.options[i];
        currentValue = this.optionValue(opt);
        if (single) {
          if (currentValue == value) {
            opt.selected = true;
            return;
          }
        }
        else opt.selected = value.include(currentValue);
      }
    }
  },

  selectOne: function(element) {
    var index = element.selectedIndex;
    return index >= 0 ? this.optionValue(element.options[index]) : null;
  },

  selectMany: function(element) {
    var values, length = element.length;
    if (!length) return null;

    for (var i = 0, values = []; i < length; i++) {
      var opt = element.options[i];
      if (opt.selected) values.push(this.optionValue(opt));
    }
    return values;
  },

  optionValue: function(opt) {
    // extend element because hasAttribute may not be native
    return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
  }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
  initialize: function($super, element, frequency, callback) {
    $super(callback, frequency);
    this.element   = $(element);
    this.lastValue = this.getValue();
  },

  execute: function() {
    var value = this.getValue();
    if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
  initialize: function(element, callback) {
    this.element  = $(element);
    this.callback = callback;

    this.lastValue = this.getValue();
    if (this.element.tagName.toLowerCase() == 'form')
      this.registerFormCallbacks();
    else
      this.registerCallback(this.element);
  },

  onElementEvent: function() {
    var value = this.getValue();
    if (this.lastValue != value) {
      this.callback(this.element, value);
      this.lastValue = value;
    }
  },

  registerFormCallbacks: function() {
    Form.getElements(this.element).each(this.registerCallback, this);
  },

  registerCallback: function(element) {
    if (element.type) {
      switch (element.type.toLowerCase()) {
        case 'checkbox':
        case 'radio':
          Event.observe(element, 'click', this.onElementEvent.bind(this));
          break;
        default:
          Event.observe(element, 'change', this.onElementEvent.bind(this));
          break;
      }
    }
  }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.Element.getValue(this.element);
  }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
  getValue: function() {
    return Form.serialize(this.element);
  }
});
if (!window.Event) var Event = { };

Object.extend(Event, {
  KEY_BACKSPACE: 8,
  KEY_TAB:       9,
  KEY_RETURN:   13,
  KEY_ESC:      27,
  KEY_LEFT:     37,
  KEY_UP:       38,
  KEY_RIGHT:    39,
  KEY_DOWN:     40,
  KEY_DELETE:   46,
  KEY_HOME:     36,
  KEY_END:      35,
  KEY_PAGEUP:   33,
  KEY_PAGEDOWN: 34,
  KEY_INSERT:   45,

  cache: { },

  relatedTarget: function(event) {
    var element;
    switch(event.type) {
      case 'mouseover': element = event.fromElement; break;
      case 'mouseout':  element = event.toElement;   break;
      default: return null;
    }
    return Element.extend(element);
  }
});

Event.Methods = (function() {
  var isButton;

  if (Prototype.Browser.IE) {
    var buttonMap = { 0: 1, 1: 4, 2: 2 };
    isButton = function(event, code) {
      return event.button == buttonMap[code];
    };

  } else if (Prototype.Browser.WebKit) {
    isButton = function(event, code) {
      switch (code) {
        case 0: return event.which == 1 && !event.metaKey;
        case 1: return event.which == 1 && event.metaKey;
        default: return false;
      }
    };

  } else {
    isButton = function(event, code) {
      return event.which ? (event.which === code + 1) : (event.button === code);
    };
  }

  return {
    isLeftClick:   function(event) { return isButton(event, 0) },
    isMiddleClick: function(event) { return isButton(event, 1) },
    isRightClick:  function(event) { return isButton(event, 2) },

    element: function(event) {
      event = Event.extend(event);

      var node          = event.target,
          type          = event.type,
          currentTarget = event.currentTarget;

      if (currentTarget && currentTarget.tagName) {
        // Firefox screws up the "click" event when moving between radio buttons
        // via arrow keys. It also screws up the "load" and "error" events on images,
        // reporting the document as the target instead of the original image.
        if (type === 'load' || type === 'error' ||
          (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
            && currentTarget.type === 'radio'))
              node = currentTarget;
      }
      if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
      return Element.extend(node);
    },

    findElement: function(event, expression) {
      var element = Event.element(event);
      if (!expression) return element;
      var elements = [element].concat(element.ancestors());
      return Selector.findElement(elements, expression, 0);
    },

    pointer: function(event) {
      var docElement = document.documentElement,
      body = document.body || { scrollLeft: 0, scrollTop: 0 };
      return {
        x: event.pageX || (event.clientX +
          (docElement.scrollLeft || body.scrollLeft) -
          (docElement.clientLeft || 0)),
        y: event.pageY || (event.clientY +
          (docElement.scrollTop || body.scrollTop) -
          (docElement.clientTop || 0))
      };
    },

    pointerX: function(event) { return Event.pointer(event).x },
    pointerY: function(event) { return Event.pointer(event).y },

    stop: function(event) {
      Event.extend(event);
      event.preventDefault();
      event.stopPropagation();
      event.stopped = true;
    }
  };
})();

Event.extend = (function() {
  var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
    m[name] = Event.Methods[name].methodize();
    return m;
  });

  if (Prototype.Browser.IE) {
    Object.extend(methods, {
      stopPropagation: function() { this.cancelBubble = true },
      preventDefault:  function() { this.returnValue = false },
      inspect: function() { return "[object Event]" }
    });

    return function(event) {
      if (!event) return false;
      if (event._extendedByPrototype) return event;

      event._extendedByPrototype = Prototype.emptyFunction;
      var pointer = Event.pointer(event);
      Object.extend(event, {
        target: event.srcElement,
        relatedTarget: Event.relatedTarget(event),
        pageX:  pointer.x,
        pageY:  pointer.y
      });
      return Object.extend(event, methods);
    };

  } else {
    Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
    Object.extend(Event.prototype, methods);
    return Prototype.K;
  }
})();

Object.extend(Event, (function() {
  var cache = Event.cache;

  function getEventID(element) {
    if (element._prototypeEventID) return element._prototypeEventID[0];
    arguments.callee.id = arguments.callee.id || 1;
    return element._prototypeEventID = [++arguments.callee.id];
  }

  function getDOMEventName(eventName) {
    if (eventName && eventName.include(':')) return "dataavailable";
    return eventName;
  }

  function getCacheForID(id) {
    return cache[id] = cache[id] || { };
  }

  function getWrappersForEventName(id, eventName) {
    var c = getCacheForID(id);
    return c[eventName] = c[eventName] || [];
  }

  function createWrapper(element, eventName, handler) {
    var id = getEventID(element);
    var c = getWrappersForEventName(id, eventName);
    if (c.pluck("handler").include(handler)) return false;

    var wrapper = function(event) {
      if (!Event || !Event.extend ||
        (event.eventName && event.eventName != eventName))
          return false;

      Event.extend(event);
      handler.call(element, event);
    };

    wrapper.handler = handler;
    c.push(wrapper);
    return wrapper;
  }

  function findWrapper(id, eventName, handler) {
    var c = getWrappersForEventName(id, eventName);
    return c.find(function(wrapper) { return wrapper.handler == handler });
  }

  function destroyWrapper(id, eventName, handler) {
    var c = getCacheForID(id);
    if (!c[eventName]) return false;
    c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
  }

  function destroyCache() {
    for (var id in cache)
      for (var eventName in cache[id])
        cache[id][eventName] = null;
  }


  // Internet Explorer needs to remove event handlers on page unload
  // in order to avoid memory leaks.
  if (window.attachEvent) {
    window.attachEvent("onunload", destroyCache);
  }

  // Safari has a dummy event handler on page unload so that it won't
  // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
  // object when page is returned to via the back button using its bfcache.
  if (Prototype.Browser.WebKit) {
    window.addEventListener('unload', Prototype.emptyFunction, false);
  }

  return {
    observe: function(element, eventName, handler) {
      element = $(element);
      var name = getDOMEventName(eventName);

      var wrapper = createWrapper(element, eventName, handler);
      if (!wrapper) return element;

      if (element.addEventListener) {
        element.addEventListener(name, wrapper, false);
      } else {
        element.attachEvent("on" + name, wrapper);
      }

      return element;
    },

    stopObserving: function(element, eventName, handler) {
      element = $(element);
      var id = getEventID(element), name = getDOMEventName(eventName);

      if (!handler && eventName) {
        getWrappersForEventName(id, eventName).each(function(wrapper) {
          element.stopObserving(eventName, wrapper.handler);
        });
        return element;

      } else if (!eventName) {
        Object.keys(getCacheForID(id)).each(function(eventName) {
          element.stopObserving(eventName);
        });
        return element;
      }

      var wrapper = findWrapper(id, eventName, handler);
      if (!wrapper) return element;

      if (element.removeEventListener) {
        element.removeEventListener(name, wrapper, false);
      } else {
        element.detachEvent("on" + name, wrapper);
      }

      destroyWrapper(id, eventName, handler);

      return element;
    },

    fire: function(element, eventName, memo) {
      element = $(element);
      if (element == document && document.createEvent && !element.dispatchEvent)
        element = document.documentElement;

      var event;
      if (document.createEvent) {
        event = document.createEvent("HTMLEvents");
        event.initEvent("dataavailable", true, true);
      } else {
        event = document.createEventObject();
        event.eventType = "ondataavailable";
      }

      event.eventName = eventName;
      event.memo = memo || { };

      if (document.createEvent) {
        element.dispatchEvent(event);
      } else {
        element.fireEvent(event.eventType, event);
      }

      return Event.extend(event);
    }
  };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
  fire:          Event.fire,
  observe:       Event.observe,
  stopObserving: Event.stopObserving
});

Object.extend(document, {
  fire:          Element.Methods.fire.methodize(),
  observe:       Element.Methods.observe.methodize(),
  stopObserving: Element.Methods.stopObserving.methodize(),
  loaded:        false
});

(function() {
  /* Support for the DOMContentLoaded event is based on work by Dan Webb,
     Matthias Miller, Dean Edwards and John Resig. */

  var timer;

  function fireContentLoadedEvent() {
    if (document.loaded) return;
    if (timer) window.clearInterval(timer);
    document.fire("dom:loaded");
    document.loaded = true;
  }

  if (document.addEventListener) {
    if (Prototype.Browser.WebKit) {
      timer = window.setInterval(function() {
        if (/loaded|complete/.test(document.readyState))
          fireContentLoadedEvent();
      }, 0);

      Event.observe(window, "load", fireContentLoadedEvent);

    } else {
      document.addEventListener("DOMContentLoaded",
        fireContentLoadedEvent, false);
    }

  } else {
    document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
    $("__onDOMContentLoaded").onreadystatechange = function() {
      if (this.readyState == "complete") {
        this.onreadystatechange = null;
        fireContentLoadedEvent();
      }
    };
  }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
  Before: function(element, content) {
    return Element.insert(element, {before:content});
  },

  Top: function(element, content) {
    return Element.insert(element, {top:content});
  },

  Bottom: function(element, content) {
    return Element.insert(element, {bottom:content});
  },

  After: function(element, content) {
    return Element.insert(element, {after:content});
  }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

// This should be moved to script.aculo.us; notice the deprecated methods
// further below, that map to the newer Element methods.
var Position = {
  // set to true if needed, warning: firefox performance problems
  // NOT neeeded for page scrolling, only if draggable contained in
  // scrollable elements
  includeScrollOffsets: false,

  // must be called before calling withinIncludingScrolloffset, every time the
  // page is scrolled
  prepare: function() {
    this.deltaX =  window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
    this.deltaY =  window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
  },

  // caches x/y coordinate pair to use with overlap
  within: function(element, x, y) {
    if (this.includeScrollOffsets)
      return this.withinIncludingScrolloffsets(element, x, y);
    this.xcomp = x;
    this.ycomp = y;
    this.offset = Element.cumulativeOffset(element);

    return (y >= this.offset[1] &&
            y <  this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x <  this.offset[0] + element.offsetWidth);
  },

  withinIncludingScrolloffsets: function(element, x, y) {
    var offsetcache = Element.cumulativeScrollOffset(element);

    this.xcomp = x + offsetcache[0] - this.deltaX;
    this.ycomp = y + offsetcache[1] - this.deltaY;
    this.offset = Element.cumulativeOffset(element);

    return (this.ycomp >= this.offset[1] &&
            this.ycomp <  this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp <  this.offset[0] + element.offsetWidth);
  },

  // within must be called directly before
  overlap: function(mode, element) {
    if (!mode) return 0;
    if (mode == 'vertical')
      return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
    if (mode == 'horizontal')
      return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
  },

  // Deprecation layer -- use newer Element methods now (1.5.2).

  cumulativeOffset: Element.Methods.cumulativeOffset,

  positionedOffset: Element.Methods.positionedOffset,

  absolutize: function(element) {
    Position.prepare();
    return Element.absolutize(element);
  },

  relativize: function(element) {
    Position.prepare();
    return Element.relativize(element);
  },

  realOffset: Element.Methods.cumulativeScrollOffset,

  offsetParent: Element.Methods.getOffsetParent,

  page: Element.Methods.viewportOffset,

  clone: function(source, target, options) {
    options = options || { };
    return Element.clonePosition(target, source, options);
  }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
  function iter(name) {
    return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
  }

  instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function(element, className) {
    className = className.toString().strip();
    var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
    return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function(element, className) {
    className = className.toString().strip();
    var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
    if (!classNames && !className) return elements;

    var nodes = $(element).getElementsByTagName('*');
    className = ' ' + className + ' ';

    for (var i = 0, child, cn; child = nodes[i]; i++) {
      if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function(name) {
            return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
        elements.push(Element.extend(child));
    }
    return elements;
  };

  return function(className, parentElement) {
    return $(parentElement || document.body).getElementsByClassName(className);
  };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
  initialize: function(element) {
    this.element = $(element);
  },

  _each: function(iterator) {
    this.element.className.split(/\s+/).select(function(name) {
      return name.length > 0;
    })._each(iterator);
  },

  set: function(className) {
    this.element.className = className;
  },

  add: function(classNameToAdd) {
    if (this.include(classNameToAdd)) return;
    this.set($A(this).concat(classNameToAdd).join(' '));
  },

  remove: function(classNameToRemove) {
    if (!this.include(classNameToRemove)) return;
    this.set($A(this).without(classNameToRemove).join(' '));
  },

  toString: function() {
    return $A(this).join(' ');
  }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();/*  Prototype JavaScript framework, version 1.6.0.3
 *  (c) 2005-2008 Sam Stephenson
*
*  Prototype is freely distributable under the terms of an MIT-style license.
*  For details, see the Prototype web site: http://www.prototypejs.org/
*
*--------------------------------------------------------------------------*/

var Prototype = {
 Version: '1.6.0.3',

 Browser: {
   IE:     !!(window.attachEvent &&
     navigator.userAgent.indexOf('Opera') === -1),
   Opera:  navigator.userAgent.indexOf('Opera') > -1,
   WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
   Gecko:  navigator.userAgent.indexOf('Gecko') > -1 &&
     navigator.userAgent.indexOf('KHTML') === -1,
   MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
 },

 BrowserFeatures: {
   XPath: !!document.evaluate,
   SelectorsAPI: !!document.querySelector,
   ElementExtensions: !!window.HTMLElement,
   SpecificElementExtensions:
     document.createElement('div')['__proto__'] &&
     document.createElement('div')['__proto__'] !==
       document.createElement('form')['__proto__']
 },

 ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
 JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

 emptyFunction: function() { },
 K: function(x) { return x }
};

if (Prototype.Browser.MobileSafari)
 Prototype.BrowserFeatures.SpecificElementExtensions = false;


/* Based on Alex Arnell's inheritance implementation. */
var Class = {
 create: function() {
   var parent = null, properties = $A(arguments);
   if (Object.isFunction(properties[0]))
     parent = properties.shift();

   function klass() {
     this.initialize.apply(this, arguments);
   }

   Object.extend(klass, Class.Methods);
   klass.superclass = parent;
   klass.subclasses = [];

   if (parent) {
     var subclass = function() { };
     subclass.prototype = parent.prototype;
     klass.prototype = new subclass;
     parent.subclasses.push(klass);
   }

   for (var i = 0; i < properties.length; i++)
     klass.addMethods(properties[i]);

   if (!klass.prototype.initialize)
     klass.prototype.initialize = Prototype.emptyFunction;

   klass.prototype.constructor = klass;

   return klass;
 }
};

Class.Methods = {
 addMethods: function(source) {
   var ancestor   = this.superclass && this.superclass.prototype;
   var properties = Object.keys(source);

   if (!Object.keys({ toString: true }).length)
     properties.push("toString", "valueOf");

   for (var i = 0, length = properties.length; i < length; i++) {
     var property = properties[i], value = source[property];
     if (ancestor && Object.isFunction(value) &&
         value.argumentNames().first() == "$super") {
       var method = value;
       value = (function(m) {
         return function() { return ancestor[m].apply(this, arguments) };
       })(property).wrap(method);

       value.valueOf = method.valueOf.bind(method);
       value.toString = method.toString.bind(method);
     }
     this.prototype[property] = value;
   }

   return this;
 }
};

var Abstract = { };

Object.extend = function(destination, source) {
 for (var property in source)
   destination[property] = source[property];
 return destination;
};

Object.extend(Object, {
 inspect: function(object) {
   try {
     if (Object.isUndefined(object)) return 'undefined';
     if (object === null) return 'null';
     return object.inspect ? object.inspect() : String(object);
   } catch (e) {
     if (e instanceof RangeError) return '...';
     throw e;
   }
 },

 toJSON: function(object) {
   var type = typeof object;
   switch (type) {
     case 'undefined':
     case 'function':
     case 'unknown': return;
     case 'boolean': return object.toString();
   }

   if (object === null) return 'null';
   if (object.toJSON) return object.toJSON();
   if (Object.isElement(object)) return;

   var results = [];
   for (var property in object) {
     var value = Object.toJSON(object[property]);
     if (!Object.isUndefined(value))
       results.push(property.toJSON() + ': ' + value);
   }

   return '{' + results.join(', ') + '}';
 },

 toQueryString: function(object) {
   return $H(object).toQueryString();
 },

 toHTML: function(object) {
   return object && object.toHTML ? object.toHTML() : String.interpret(object);
 },

 keys: function(object) {
   var keys = [];
   for (var property in object)
     keys.push(property);
   return keys;
 },

 values: function(object) {
   var values = [];
   for (var property in object)
     values.push(object[property]);
   return values;
 },

 clone: function(object) {
   return Object.extend({ }, object);
 },

 isElement: function(object) {
   return !!(object && object.nodeType == 1);
 },

 isArray: function(object) {
   return object != null && typeof object == "object" &&
     'splice' in object && 'join' in object;
 },

 isHash: function(object) {
   return object instanceof Hash;
 },

 isFunction: function(object) {
   return typeof object == "function";
 },

 isString: function(object) {
   return typeof object == "string";
 },

 isNumber: function(object) {
   return typeof object == "number";
 },

 isUndefined: function(object) {
   return typeof object == "undefined";
 }
});

Object.extend(Function.prototype, {
 argumentNames: function() {
   var names = this.toString().match(/^[\s\(]*function[^(]*\(([^\)]*)\)/)[1]
     .replace(/\s+/g, '').split(',');
   return names.length == 1 && !names[0] ? [] : names;
 },

 bind: function() {
   if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
   var __method = this, args = $A(arguments), object = args.shift();
   return function() {
     return __method.apply(object, args.concat($A(arguments)));
   }
 },

 bindAsEventListener: function() {
   var __method = this, args = $A(arguments), object = args.shift();
   return function(event) {
     return __method.apply(object, [event || window.event].concat(args));
   }
 },

 curry: function() {
   if (!arguments.length) return this;
   var __method = this, args = $A(arguments);
   return function() {
     return __method.apply(this, args.concat($A(arguments)));
   }
 },

 delay: function() {
   var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
   return window.setTimeout(function() {
     return __method.apply(__method, args);
   }, timeout);
 },

 defer: function() {
   var args = [0.01].concat($A(arguments));
   return this.delay.apply(this, args);
 },

 wrap: function(wrapper) {
   var __method = this;
   return function() {
     return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
   }
 },

 methodize: function() {
   if (this._methodized) return this._methodized;
   var __method = this;
   return this._methodized = function() {
     return __method.apply(null, [this].concat($A(arguments)));
   };
 }
});

Date.prototype.toJSON = function() {
 return '"' + this.getUTCFullYear() + '-' +
   (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
   this.getUTCDate().toPaddedString(2) + 'T' +
   this.getUTCHours().toPaddedString(2) + ':' +
   this.getUTCMinutes().toPaddedString(2) + ':' +
   this.getUTCSeconds().toPaddedString(2) + 'Z"';
};

var Try = {
 these: function() {
   var returnValue;

   for (var i = 0, length = arguments.length; i < length; i++) {
     var lambda = arguments[i];
     try {
       returnValue = lambda();
       break;
     } catch (e) { }
   }

   return returnValue;
 }
};

RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function(str) {
 return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};

/*--------------------------------------------------------------------------*/

var PeriodicalExecuter = Class.create({
 initialize: function(callback, frequency) {
   this.callback = callback;
   this.frequency = frequency;
   this.currentlyExecuting = false;

   this.registerCallback();
 },

 registerCallback: function() {
   this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
 },

 execute: function() {
   this.callback(this);
 },

 stop: function() {
   if (!this.timer) return;
   clearInterval(this.timer);
   this.timer = null;
 },

 onTimerEvent: function() {
   if (!this.currentlyExecuting) {
     try {
       this.currentlyExecuting = true;
       this.execute();
     } finally {
       this.currentlyExecuting = false;
     }
   }
 }
});
Object.extend(String, {
 interpret: function(value) {
   return value == null ? '' : String(value);
 },
 specialChar: {
   '\b': '\\b',
   '\t': '\\t',
   '\n': '\\n',
   '\f': '\\f',
   '\r': '\\r',
   '\\': '\\\\'
 }
});

Object.extend(String.prototype, {
 gsub: function(pattern, replacement) {
   var result = '', source = this, match;
   replacement = arguments.callee.prepareReplacement(replacement);

   while (source.length > 0) {
     if (match = source.match(pattern)) {
       result += source.slice(0, match.index);
       result += String.interpret(replacement(match));
       source  = source.slice(match.index + match[0].length);
     } else {
       result += source, source = '';
     }
   }
   return result;
 },

 sub: function(pattern, replacement, count) {
   replacement = this.gsub.prepareReplacement(replacement);
   count = Object.isUndefined(count) ? 1 : count;

   return this.gsub(pattern, function(match) {
     if (--count < 0) return match[0];
     return replacement(match);
   });
 },

 scan: function(pattern, iterator) {
   this.gsub(pattern, iterator);
   return String(this);
 },

 truncate: function(length, truncation) {
   length = length || 30;
   truncation = Object.isUndefined(truncation) ? '...' : truncation;
   return this.length > length ?
     this.slice(0, length - truncation.length) + truncation : String(this);
 },

 strip: function() {
   return this.replace(/^\s+/, '').replace(/\s+$/, '');
 },

 stripTags: function() {
   return this.replace(/<\/?[^>]+>/gi, '');
 },

 stripScripts: function() {
   return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
 },

 extractScripts: function() {
   var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
   var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
   return (this.match(matchAll) || []).map(function(scriptTag) {
     return (scriptTag.match(matchOne) || ['', ''])[1];
   });
 },

 evalScripts: function() {
   return this.extractScripts().map(function(script) { return eval(script) });
 },

 escapeHTML: function() {
   var self = arguments.callee;
   self.text.data = this;
   return self.div.innerHTML;
 },

 unescapeHTML: function() {
   var div = new Element('div');
   div.innerHTML = this.stripTags();
   return div.childNodes[0] ? (div.childNodes.length > 1 ?
     $A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) :
     div.childNodes[0].nodeValue) : '';
 },

 toQueryParams: function(separator) {
   var match = this.strip().match(/([^?#]*)(#.*)?$/);
   if (!match) return { };

   return match[1].split(separator || '&').inject({ }, function(hash, pair) {
     if ((pair = pair.split('='))[0]) {
       var key = decodeURIComponent(pair.shift());
       var value = pair.length > 1 ? pair.join('=') : pair[0];
       if (value != undefined) value = decodeURIComponent(value);

       if (key in hash) {
         if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
         hash[key].push(value);
       }
       else hash[key] = value;
     }
     return hash;
   });
 },

 toArray: function() {
   return this.split('');
 },

 succ: function() {
   return this.slice(0, this.length - 1) +
     String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
 },

 times: function(count) {
   return count < 1 ? '' : new Array(count + 1).join(this);
 },

 camelize: function() {
   var parts = this.split('-'), len = parts.length;
   if (len == 1) return parts[0];

   var camelized = this.charAt(0) == '-'
     ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)
     : parts[0];

   for (var i = 1; i < len; i++)
     camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

   return camelized;
 },

 capitalize: function() {
   return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
 },

 underscore: function() {
   return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
 },

 dasherize: function() {
   return this.gsub(/_/,'-');
 },

 inspect: function(useDoubleQuotes) {
   var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match) {
     var character = String.specialChar[match[0]];
     return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
   });
   if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
   return "'" + escapedString.replace(/'/g, '\\\'') + "'";
 },

 toJSON: function() {
   return this.inspect(true);
 },

 unfilterJSON: function(filter) {
   return this.sub(filter || Prototype.JSONFilter, '#{1}');
 },

 isJSON: function() {
   var str = this;
   if (str.blank()) return false;
   str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
   return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
 },

 evalJSON: function(sanitize) {
   var json = this.unfilterJSON();
   try {
     if (!sanitize || json.isJSON()) return eval('(' + json + ')');
   } catch (e) { }
   throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
 },

 include: function(pattern) {
   return this.indexOf(pattern) > -1;
 },

 startsWith: function(pattern) {
   return this.indexOf(pattern) === 0;
 },

 endsWith: function(pattern) {
   var d = this.length - pattern.length;
   return d >= 0 && this.lastIndexOf(pattern) === d;
 },

 empty: function() {
   return this == '';
 },

 blank: function() {
   return /^\s*$/.test(this);
 },

 interpolate: function(object, pattern) {
   return new Template(this, pattern).evaluate(object);
 }
});

if (Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype, {
 escapeHTML: function() {
   return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
 },
 unescapeHTML: function() {
   return this.stripTags().replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
 }
});

String.prototype.gsub.prepareReplacement = function(replacement) {
 if (Object.isFunction(replacement)) return replacement;
 var template = new Template(replacement);
 return function(match) { return template.evaluate(match) };
};

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML, {
 div:  document.createElement('div'),
 text: document.createTextNode('')
});

String.prototype.escapeHTML.div.appendChild(String.prototype.escapeHTML.text);

var Template = Class.create({
 initialize: function(template, pattern) {
   this.template = template.toString();
   this.pattern = pattern || Template.Pattern;
 },

 evaluate: function(object) {
   if (Object.isFunction(object.toTemplateReplacements))
     object = object.toTemplateReplacements();

   return this.template.gsub(this.pattern, function(match) {
     if (object == null) return '';

     var before = match[1] || '';
     if (before == '\\') return match[2];

     var ctx = object, expr = match[3];
     var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
     match = pattern.exec(expr);
     if (match == null) return before;

     while (match != null) {
       var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : match[1];
       ctx = ctx[comp];
       if (null == ctx || '' == match[3]) break;
       expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
       match = pattern.exec(expr);
     }

     return before + String.interpret(ctx);
   });
 }
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = { };

var Enumerable = {
 each: function(iterator, context) {
   var index = 0;
   try {
     this._each(function(value) {
       iterator.call(context, value, index++);
     });
   } catch (e) {
     if (e != $break) throw e;
   }
   return this;
 },

 eachSlice: function(number, iterator, context) {
   var index = -number, slices = [], array = this.toArray();
   if (number < 1) return array;
   while ((index += number) < array.length)
     slices.push(array.slice(index, index+number));
   return slices.collect(iterator, context);
 },

 all: function(iterator, context) {
   iterator = iterator || Prototype.K;
   var result = true;
   this.each(function(value, index) {
     result = result && !!iterator.call(context, value, index);
     if (!result) throw $break;
   });
   return result;
 },

 any: function(iterator, context) {
   iterator = iterator || Prototype.K;
   var result = false;
   this.each(function(value, index) {
     if (result = !!iterator.call(context, value, index))
       throw $break;
   });
   return result;
 },

 collect: function(iterator, context) {
   iterator = iterator || Prototype.K;
   var results = [];
   this.each(function(value, index) {
     results.push(iterator.call(context, value, index));
   });
   return results;
 },

 detect: function(iterator, context) {
   var result;
   this.each(function(value, index) {
     if (iterator.call(context, value, index)) {
       result = value;
       throw $break;
     }
   });
   return result;
 },

 findAll: function(iterator, context) {
   var results = [];
   this.each(function(value, index) {
     if (iterator.call(context, value, index))
       results.push(value);
   });
   return results;
 },

 grep: function(filter, iterator, context) {
   iterator = iterator || Prototype.K;
   var results = [];

   if (Object.isString(filter))
     filter = new RegExp(filter);

   this.each(function(value, index) {
     if (filter.match(value))
       results.push(iterator.call(context, value, index));
   });
   return results;
 },

 include: function(object) {
   if (Object.isFunction(this.indexOf))
     if (this.indexOf(object) != -1) return true;

   var found = false;
   this.each(function(value) {
     if (value == object) {
       found = true;
       throw $break;
     }
   });
   return found;
 },

 inGroupsOf: function(number, fillWith) {
   fillWith = Object.isUndefined(fillWith) ? null : fillWith;
   return this.eachSlice(number, function(slice) {
     while(slice.length < number) slice.push(fillWith);
     return slice;
   });
 },

 inject: function(memo, iterator, context) {
   this.each(function(value, index) {
     memo = iterator.call(context, memo, value, index);
   });
   return memo;
 },

 invoke: function(method) {
   var args = $A(arguments).slice(1);
   return this.map(function(value) {
     return value[method].apply(value, args);
   });
 },

 max: function(iterator, context) {
   iterator = iterator || Prototype.K;
   var result;
   this.each(function(value, index) {
     value = iterator.call(context, value, index);
     if (result == null || value >= result)
       result = value;
   });
   return result;
 },

 min: function(iterator, context) {
   iterator = iterator || Prototype.K;
   var result;
   this.each(function(value, index) {
     value = iterator.call(context, value, index);
     if (result == null || value < result)
       result = value;
   });
   return result;
 },

 partition: function(iterator, context) {
   iterator = iterator || Prototype.K;
   var trues = [], falses = [];
   this.each(function(value, index) {
     (iterator.call(context, value, index) ?
       trues : falses).push(value);
   });
   return [trues, falses];
 },

 pluck: function(property) {
   var results = [];
   this.each(function(value) {
     results.push(value[property]);
   });
   return results;
 },

 reject: function(iterator, context) {
   var results = [];
   this.each(function(value, index) {
     if (!iterator.call(context, value, index))
       results.push(value);
   });
   return results;
 },

 sortBy: function(iterator, context) {
   return this.map(function(value, index) {
     return {
       value: value,
       criteria: iterator.call(context, value, index)
     };
   }).sort(function(left, right) {
     var a = left.criteria, b = right.criteria;
     return a < b ? -1 : a > b ? 1 : 0;
   }).pluck('value');
 },

 toArray: function() {
   return this.map();
 },

 zip: function() {
   var iterator = Prototype.K, args = $A(arguments);
   if (Object.isFunction(args.last()))
     iterator = args.pop();

   var collections = [this].concat(args).map($A);
   return this.map(function(value, index) {
     return iterator(collections.pluck(index));
   });
 },

 size: function() {
   return this.toArray().length;
 },

 inspect: function() {
   return '#<Enumerable:' + this.toArray().inspect() + '>';
 }
};

Object.extend(Enumerable, {
 map:     Enumerable.collect,
 find:    Enumerable.detect,
 select:  Enumerable.findAll,
 filter:  Enumerable.findAll,
 member:  Enumerable.include,
 entries: Enumerable.toArray,
 every:   Enumerable.all,
 some:    Enumerable.any
});
function $A(iterable) {
 if (!iterable) return [];
 if (iterable.toArray) return iterable.toArray();
 var length = iterable.length || 0, results = new Array(length);
 while (length--) results[length] = iterable[length];
 return results;
}

if (Prototype.Browser.WebKit) {
 $A = function(iterable) {
   if (!iterable) return [];
   // In Safari, only use the `toArray` method if it's not a NodeList.
   // A NodeList is a function, has an function `item` property, and a numeric
   // `length` property. Adapted from Google Doctype.
   if (!(typeof iterable === 'function' && typeof iterable.length ===
       'number' && typeof iterable.item === 'function') && iterable.toArray)
     return iterable.toArray();
   var length = iterable.length || 0, results = new Array(length);
   while (length--) results[length] = iterable[length];
   return results;
 };
}

Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if (!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype, {
 _each: function(iterator) {
   for (var i = 0, length = this.length; i < length; i++)
     iterator(this[i]);
 },

 clear: function() {
   this.length = 0;
   return this;
 },

 first: function() {
   return this[0];
 },

 last: function() {
   return this[this.length - 1];
 },

 compact: function() {
   return this.select(function(value) {
     return value != null;
   });
 },

 flatten: function() {
   return this.inject([], function(array, value) {
     return array.concat(Object.isArray(value) ?
       value.flatten() : [value]);
   });
 },

 without: function() {
   var values = $A(arguments);
   return this.select(function(value) {
     return !values.include(value);
   });
 },

 reverse: function(inline) {
   return (inline !== false ? this : this.toArray())._reverse();
 },

 reduce: function() {
   return this.length > 1 ? this : this[0];
 },

 uniq: function(sorted) {
   return this.inject([], function(array, value, index) {
     if (0 == index || (sorted ? array.last() != value : !array.include(value)))
       array.push(value);
     return array;
   });
 },

 intersect: function(array) {
   return this.uniq().findAll(function(item) {
     return array.detect(function(value) { return item === value });
   });
 },

 clone: function() {
   return [].concat(this);
 },

 size: function() {
   return this.length;
 },

 inspect: function() {
   return '[' + this.map(Object.inspect).join(', ') + ']';
 },

 toJSON: function() {
   var results = [];
   this.each(function(object) {
     var value = Object.toJSON(object);
     if (!Object.isUndefined(value)) results.push(value);
   });
   return '[' + results.join(', ') + ']';
 }
});

//use native browser JS 1.6 implementation if available
if (Object.isFunction(Array.prototype.forEach))
 Array.prototype._each = Array.prototype.forEach;

if (!Array.prototype.indexOf) Array.prototype.indexOf = function(item, i) {
 i || (i = 0);
 var length = this.length;
 if (i < 0) i = length + i;
 for (; i < length; i++)
   if (this[i] === item) return i;
 return -1;
};

if (!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(item, i) {
 i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
 var n = this.slice(0, i).reverse().indexOf(item);
 return (n < 0) ? n : i - n - 1;
};

Array.prototype.toArray = Array.prototype.clone;

function $w(string) {
 if (!Object.isString(string)) return [];
 string = string.strip();
 return string ? string.split(/\s+/) : [];
}

if (Prototype.Browser.Opera){
 Array.prototype.concat = function() {
   var array = [];
   for (var i = 0, length = this.length; i < length; i++) array.push(this[i]);
   for (var i = 0, length = arguments.length; i < length; i++) {
     if (Object.isArray(arguments[i])) {
       for (var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
         array.push(arguments[i][j]);
     } else {
       array.push(arguments[i]);
     }
   }
   return array;
 };
}
Object.extend(Number.prototype, {
 toColorPart: function() {
   return this.toPaddedString(2, 16);
 },

 succ: function() {
   return this + 1;
 },

 times: function(iterator, context) {
   $R(0, this, true).each(iterator, context);
   return this;
 },

 toPaddedString: function(length, radix) {
   var string = this.toString(radix || 10);
   return '0'.times(length - string.length) + string;
 },

 toJSON: function() {
   return isFinite(this) ? this.toString() : 'null';
 }
});

$w('abs round ceil floor').each(function(method){
 Number.prototype[method] = Math[method].methodize();
});
function $H(object) {
 return new Hash(object);
};

var Hash = Class.create(Enumerable, (function() {

 function toQueryPair(key, value) {
   if (Object.isUndefined(value)) return key;
   return key + '=' + encodeURIComponent(String.interpret(value));
 }

 return {
   initialize: function(object) {
     this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
   },

   _each: function(iterator) {
     for (var key in this._object) {
       var value = this._object[key], pair = [key, value];
       pair.key = key;
       pair.value = value;
       iterator(pair);
     }
   },

   set: function(key, value) {
     return this._object[key] = value;
   },

   get: function(key) {
     // simulating poorly supported hasOwnProperty
     if (this._object[key] !== Object.prototype[key])
       return this._object[key];
   },

   unset: function(key) {
     var value = this._object[key];
     delete this._object[key];
     return value;
   },

   toObject: function() {
     return Object.clone(this._object);
   },

   keys: function() {
     return this.pluck('key');
   },

   values: function() {
     return this.pluck('value');
   },

   index: function(value) {
     var match = this.detect(function(pair) {
       return pair.value === value;
     });
     return match && match.key;
   },

   merge: function(object) {
     return this.clone().update(object);
   },

   update: function(object) {
     return new Hash(object).inject(this, function(result, pair) {
       result.set(pair.key, pair.value);
       return result;
     });
   },

   toQueryString: function() {
     return this.inject([], function(results, pair) {
       var key = encodeURIComponent(pair.key), values = pair.value;

       if (values && typeof values == 'object') {
         if (Object.isArray(values))
           return results.concat(values.map(toQueryPair.curry(key)));
       } else results.push(toQueryPair(key, values));
       return results;
     }).join('&');
   },

   inspect: function() {
     return '#<Hash:{' + this.map(function(pair) {
       return pair.map(Object.inspect).join(': ');
     }).join(', ') + '}>';
   },

   toJSON: function() {
     return Object.toJSON(this.toObject());
   },

   clone: function() {
     return new Hash(this);
   }
 }
})());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable, {
 initialize: function(start, end, exclusive) {
   this.start = start;
   this.end = end;
   this.exclusive = exclusive;
 },

 _each: function(iterator) {
   var value = this.start;
   while (this.include(value)) {
     iterator(value);
     value = value.succ();
   }
 },

 include: function(value) {
   if (value < this.start)
     return false;
   if (this.exclusive)
     return value < this.end;
   return value <= this.end;
 }
});

var $R = function(start, end, exclusive) {
 return new ObjectRange(start, end, exclusive);
};

var Ajax = {
 getTransport: function() {
   return Try.these(
     function() {return new XMLHttpRequest()},
     function() {return new ActiveXObject('Msxml2.XMLHTTP')},
     function() {return new ActiveXObject('Microsoft.XMLHTTP')}
   ) || false;
 },

 activeRequestCount: 0
};

Ajax.Responders = {
 responders: [],

 _each: function(iterator) {
   this.responders._each(iterator);
 },

 register: function(responder) {
   if (!this.include(responder))
     this.responders.push(responder);
 },

 unregister: function(responder) {
   this.responders = this.responders.without(responder);
 },

 dispatch: function(callback, request, transport, json) {
   this.each(function(responder) {
     if (Object.isFunction(responder[callback])) {
       try {
         responder[callback].apply(responder, [request, transport, json]);
       } catch (e) { }
     }
   });
 }
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
 onCreate:   function() { Ajax.activeRequestCount++ },
 onComplete: function() { Ajax.activeRequestCount-- }
});

Ajax.Base = Class.create({
 initialize: function(options) {
   this.options = {
     method:       'post',
     asynchronous: true,
     contentType:  'application/x-www-form-urlencoded',
     encoding:     'UTF-8',
     parameters:   '',
     evalJSON:     true,
     evalJS:       true
   };
   Object.extend(this.options, options || { });

   this.options.method = this.options.method.toLowerCase();

   if (Object.isString(this.options.parameters))
     this.options.parameters = this.options.parameters.toQueryParams();
   else if (Object.isHash(this.options.parameters))
     this.options.parameters = this.options.parameters.toObject();
 }
});

Ajax.Request = Class.create(Ajax.Base, {
 _complete: false,

 initialize: function($super, url, options) {
   $super(options);
   this.transport = Ajax.getTransport();
   this.request(url);
 },

 request: function(url) {
   this.url = url;
   this.method = this.options.method;
   var params = Object.clone(this.options.parameters);

   if (!['get', 'post'].include(this.method)) {
     // simulate other verbs over post
     params['_method'] = this.method;
     this.method = 'post';
   }

   this.parameters = params;

   if (params = Object.toQueryString(params)) {
     // when GET, append parameters to URL
     if (this.method == 'get')
       this.url += (this.url.include('?') ? '&' : '?') + params;
     else if (/Konqueror|Safari|KHTML/.test(navigator.userAgent))
       params += '&_=';
   }

   try {
     var response = new Ajax.Response(this);
     if (this.options.onCreate) this.options.onCreate(response);
     Ajax.Responders.dispatch('onCreate', this, response);

     this.transport.open(this.method.toUpperCase(), this.url,
       this.options.asynchronous);

     if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

     this.transport.onreadystatechange = this.onStateChange.bind(this);
     this.setRequestHeaders();

     this.body = this.method == 'post' ? (this.options.postBody || params) : null;
     this.transport.send(this.body);

     /* Force Firefox to handle ready state 4 for synchronous requests */
     if (!this.options.asynchronous && this.transport.overrideMimeType)
       this.onStateChange();

   }
   catch (e) {
     this.dispatchException(e);
   }
 },

 onStateChange: function() {
   var readyState = this.transport.readyState;
   if (readyState > 1 && !((readyState == 4) && this._complete))
     this.respondToReadyState(this.transport.readyState);
 },

 setRequestHeaders: function() {
   var headers = {
     'X-Requested-With': 'XMLHttpRequest',
     'X-Prototype-Version': Prototype.Version,
     'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
   };

   if (this.method == 'post') {
     headers['Content-type'] = this.options.contentType +
       (this.options.encoding ? '; charset=' + this.options.encoding : '');

     /* Force "Connection: close" for older Mozilla browsers to work
      * around a bug where XMLHttpRequest sends an incorrect
      * Content-length header. See Mozilla Bugzilla #246651.
      */
     if (this.transport.overrideMimeType &&
         (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)
           headers['Connection'] = 'close';
   }

   // user-defined headers
   if (typeof this.options.requestHeaders == 'object') {
     var extras = this.options.requestHeaders;

     if (Object.isFunction(extras.push))
       for (var i = 0, length = extras.length; i < length; i += 2)
         headers[extras[i]] = extras[i+1];
     else
       $H(extras).each(function(pair) { headers[pair.key] = pair.value });
   }

   for (var name in headers)
     this.transport.setRequestHeader(name, headers[name]);
 },

 success: function() {
   var status = this.getStatus();
   return !status || (status >= 200 && status < 300);
 },

 getStatus: function() {
   try {
     return this.transport.status || 0;
   } catch (e) { return 0 }
 },

 respondToReadyState: function(readyState) {
   var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

   if (state == 'Complete') {
     try {
       this._complete = true;
       (this.options['on' + response.status]
        || this.options['on' + (this.success() ? 'Success' : 'Failure')]
        || Prototype.emptyFunction)(response, response.headerJSON);
     } catch (e) {
       this.dispatchException(e);
     }

     var contentType = response.getHeader('Content-type');
     if (this.options.evalJS == 'force'
         || (this.options.evalJS && this.isSameOrigin() && contentType
         && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
       this.evalResponse();
   }

   try {
     (this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
     Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
   } catch (e) {
     this.dispatchException(e);
   }

   if (state == 'Complete') {
     // avoid memory leak in MSIE: clean up
     this.transport.onreadystatechange = Prototype.emptyFunction;
   }
 },

 isSameOrigin: function() {
   var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
   return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
     protocol: location.protocol,
     domain: document.domain,
     port: location.port ? ':' + location.port : ''
   }));
 },

 getHeader: function(name) {
   try {
     return this.transport.getResponseHeader(name) || null;
   } catch (e) { return null }
 },

 evalResponse: function() {
   try {
     return eval((this.transport.responseText || '').unfilterJSON());
   } catch (e) {
     this.dispatchException(e);
   }
 },

 dispatchException: function(exception) {
   (this.options.onException || Prototype.emptyFunction)(this, exception);
   Ajax.Responders.dispatch('onException', this, exception);
 }
});

Ajax.Request.Events =
 ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Response = Class.create({
 initialize: function(request){
   this.request = request;
   var transport  = this.transport  = request.transport,
       readyState = this.readyState = transport.readyState;

   if((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
     this.status       = this.getStatus();
     this.statusText   = this.getStatusText();
     this.responseText = String.interpret(transport.responseText);
     this.headerJSON   = this._getHeaderJSON();
   }

   if(readyState == 4) {
     var xml = transport.responseXML;
     this.responseXML  = Object.isUndefined(xml) ? null : xml;
     this.responseJSON = this._getResponseJSON();
   }
 },

 status:      0,
 statusText: '',

 getStatus: Ajax.Request.prototype.getStatus,

 getStatusText: function() {
   try {
     return this.transport.statusText || '';
   } catch (e) { return '' }
 },

 getHeader: Ajax.Request.prototype.getHeader,

 getAllHeaders: function() {
   try {
     return this.getAllResponseHeaders();
   } catch (e) { return null }
 },

 getResponseHeader: function(name) {
   return this.transport.getResponseHeader(name);
 },

 getAllResponseHeaders: function() {
   return this.transport.getAllResponseHeaders();
 },

 _getHeaderJSON: function() {
   var json = this.getHeader('X-JSON');
   if (!json) return null;
   json = decodeURIComponent(escape(json));
   try {
     return json.evalJSON(this.request.options.sanitizeJSON ||
       !this.request.isSameOrigin());
   } catch (e) {
     this.request.dispatchException(e);
   }
 },

 _getResponseJSON: function() {
   var options = this.request.options;
   if (!options.evalJSON || (options.evalJSON != 'force' &&
     !(this.getHeader('Content-type') || '').include('application/json')) ||
       this.responseText.blank())
         return null;
   try {
     return this.responseText.evalJSON(options.sanitizeJSON ||
       !this.request.isSameOrigin());
   } catch (e) {
     this.request.dispatchException(e);
   }
 }
});

Ajax.Updater = Class.create(Ajax.Request, {
 initialize: function($super, container, url, options) {
   this.container = {
     success: (container.success || container),
     failure: (container.failure || (container.success ? null : container))
   };

   options = Object.clone(options);
   var onComplete = options.onComplete;
   options.onComplete = (function(response, json) {
     this.updateContent(response.responseText);
     if (Object.isFunction(onComplete)) onComplete(response, json);
   }).bind(this);

   $super(url, options);
 },

 updateContent: function(responseText) {
   var receiver = this.container[this.success() ? 'success' : 'failure'],
       options = this.options;

   if (!options.evalScripts) responseText = responseText.stripScripts();

   if (receiver = $(receiver)) {
     if (options.insertion) {
       if (Object.isString(options.insertion)) {
         var insertion = { }; insertion[options.insertion] = responseText;
         receiver.insert(insertion);
       }
       else options.insertion(receiver, responseText);
     }
     else receiver.update(responseText);
   }
 }
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
 initialize: function($super, container, url, options) {
   $super(options);
   this.onComplete = this.options.onComplete;

   this.frequency = (this.options.frequency || 2);
   this.decay = (this.options.decay || 1);

   this.updater = { };
   this.container = container;
   this.url = url;

   this.start();
 },

 start: function() {
   this.options.onComplete = this.updateComplete.bind(this);
   this.onTimerEvent();
 },

 stop: function() {
   this.updater.options.onComplete = undefined;
   clearTimeout(this.timer);
   (this.onComplete || Prototype.emptyFunction).apply(this, arguments);
 },

 updateComplete: function(response) {
   if (this.options.decay) {
     this.decay = (response.responseText == this.lastText ?
       this.decay * this.options.decay : 1);

     this.lastText = response.responseText;
   }
   this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
 },

 onTimerEvent: function() {
   this.updater = new Ajax.Updater(this.container, this.url, this.options);
 }
});
function $(element) {
 if (arguments.length > 1) {
   for (var i = 0, elements = [], length = arguments.length; i < length; i++)
     elements.push($(arguments[i]));
   return elements;
 }
 if (Object.isString(element))
   element = document.getElementById(element);
 return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
 document._getElementsByXPath = function(expression, parentElement) {
   var results = [];
   var query = document.evaluate(expression, $(parentElement) || document,
     null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
   for (var i = 0, length = query.snapshotLength; i < length; i++)
     results.push(Element.extend(query.snapshotItem(i)));
   return results;
 };
}

/*--------------------------------------------------------------------------*/

if (!window.Node) var Node = { };

if (!Node.ELEMENT_NODE) {
 // DOM level 2 ECMAScript Language Binding
 Object.extend(Node, {
   ELEMENT_NODE: 1,
   ATTRIBUTE_NODE: 2,
   TEXT_NODE: 3,
   CDATA_SECTION_NODE: 4,
   ENTITY_REFERENCE_NODE: 5,
   ENTITY_NODE: 6,
   PROCESSING_INSTRUCTION_NODE: 7,
   COMMENT_NODE: 8,
   DOCUMENT_NODE: 9,
   DOCUMENT_TYPE_NODE: 10,
   DOCUMENT_FRAGMENT_NODE: 11,
   NOTATION_NODE: 12
 });
}

(function() {
 var element = this.Element;
 this.Element = function(tagName, attributes) {
   attributes = attributes || { };
   tagName = tagName.toLowerCase();
   var cache = Element.cache;
   if (Prototype.Browser.IE && attributes.name) {
     tagName = '<' + tagName + ' name="' + attributes.name + '">';
     delete attributes.name;
     return Element.writeAttribute(document.createElement(tagName), attributes);
   }
   if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));
   return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
 };
 Object.extend(this.Element, element || { });
 if (element) this.Element.prototype = element.prototype;
}).call(window);

Element.cache = { };

Element.Methods = {
 visible: function(element) {
   return $(element).style.display != 'none';
 },

 toggle: function(element) {
   element = $(element);
   Element[Element.visible(element) ? 'hide' : 'show'](element);
   return element;
 },

 hide: function(element) {
   element = $(element);
   element.style.display = 'none';
   return element;
 },

 show: function(element) {
   element = $(element);
   element.style.display = '';
   return element;
 },

 remove: function(element) {
   element = $(element);
   element.parentNode.removeChild(element);
   return element;
 },

 update: function(element, content) {
   element = $(element);
   if (content && content.toElement) content = content.toElement();
   if (Object.isElement(content)) return element.update().insert(content);
   content = Object.toHTML(content);
   element.innerHTML = content.stripScripts();
   content.evalScripts.bind(content).defer();
   return element;
 },

 replace: function(element, content) {
   element = $(element);
   if (content && content.toElement) content = content.toElement();
   else if (!Object.isElement(content)) {
     content = Object.toHTML(content);
     var range = element.ownerDocument.createRange();
     range.selectNode(element);
     content.evalScripts.bind(content).defer();
     content = range.createContextualFragment(content.stripScripts());
   }
   element.parentNode.replaceChild(content, element);
   return element;
 },

 insert: function(element, insertions) {
   element = $(element);

   if (Object.isString(insertions) || Object.isNumber(insertions) ||
       Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
         insertions = {bottom:insertions};

   var content, insert, tagName, childNodes;

   for (var position in insertions) {
     content  = insertions[position];
     position = position.toLowerCase();
     insert = Element._insertionTranslations[position];

     if (content && content.toElement) content = content.toElement();
     if (Object.isElement(content)) {
       insert(element, content);
       continue;
     }

     content = Object.toHTML(content);

     tagName = ((position == 'before' || position == 'after')
       ? element.parentNode : element).tagName.toUpperCase();

     childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

     if (position == 'top' || position == 'after') childNodes.reverse();
     childNodes.each(insert.curry(element));

     content.evalScripts.bind(content).defer();
   }

   return element;
 },

 wrap: function(element, wrapper, attributes) {
   element = $(element);
   if (Object.isElement(wrapper))
     $(wrapper).writeAttribute(attributes || { });
   else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
   else wrapper = new Element('div', wrapper);
   if (element.parentNode)
     element.parentNode.replaceChild(wrapper, element);
   wrapper.appendChild(element);
   return wrapper;
 },

 inspect: function(element) {
   element = $(element);
   var result = '<' + element.tagName.toLowerCase();
   $H({'id': 'id', 'className': 'class'}).each(function(pair) {
     var property = pair.first(), attribute = pair.last();
     var value = (element[property] || '').toString();
     if (value) result += ' ' + attribute + '=' + value.inspect(true);
   });
   return result + '>';
 },

 recursivelyCollect: function(element, property) {
   element = $(element);
   var elements = [];
   while (element = element[property])
     if (element.nodeType == 1)
       elements.push(Element.extend(element));
   return elements;
 },

 ancestors: function(element) {
   return $(element).recursivelyCollect('parentNode');
 },

 descendants: function(element) {
   return $(element).select("*");
 },

 firstDescendant: function(element) {
   element = $(element).firstChild;
   while (element && element.nodeType != 1) element = element.nextSibling;
   return $(element);
 },

 immediateDescendants: function(element) {
   if (!(element = $(element).firstChild)) return [];
   while (element && element.nodeType != 1) element = element.nextSibling;
   if (element) return [element].concat($(element).nextSiblings());
   return [];
 },

 previousSiblings: function(element) {
   return $(element).recursivelyCollect('previousSibling');
 },

 nextSiblings: function(element) {
   return $(element).recursivelyCollect('nextSibling');
 },

 siblings: function(element) {
   element = $(element);
   return element.previousSiblings().reverse().concat(element.nextSiblings());
 },

 match: function(element, selector) {
   if (Object.isString(selector))
     selector = new Selector(selector);
   return selector.match($(element));
 },

 up: function(element, expression, index) {
   element = $(element);
   if (arguments.length == 1) return $(element.parentNode);
   var ancestors = element.ancestors();
   return Object.isNumber(expression) ? ancestors[expression] :
     Selector.findElement(ancestors, expression, index);
 },

 down: function(element, expression, index) {
   element = $(element);
   if (arguments.length == 1) return element.firstDescendant();
   return Object.isNumber(expression) ? element.descendants()[expression] :
     Element.select(element, expression)[index || 0];
 },

 previous: function(element, expression, index) {
   element = $(element);
   if (arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
   var previousSiblings = element.previousSiblings();
   return Object.isNumber(expression) ? previousSiblings[expression] :
     Selector.findElement(previousSiblings, expression, index);
 },

 next: function(element, expression, index) {
   element = $(element);
   if (arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
   var nextSiblings = element.nextSiblings();
   return Object.isNumber(expression) ? nextSiblings[expression] :
     Selector.findElement(nextSiblings, expression, index);
 },

 select: function() {
   var args = $A(arguments), element = $(args.shift());
   return Selector.findChildElements(element, args);
 },

 adjacent: function() {
   var args = $A(arguments), element = $(args.shift());
   return Selector.findChildElements(element.parentNode, args).without(element);
 },

 identify: function(element) {
   element = $(element);
   var id = element.readAttribute('id'), self = arguments.callee;
   if (id) return id;
   do { id = 'anonymous_element_' + self.counter++ } while ($(id));
   element.writeAttribute('id', id);
   return id;
 },

 readAttribute: function(element, name) {
   element = $(element);
   if (Prototype.Browser.IE) {
     var t = Element._attributeTranslations.read;
     if (t.values[name]) return t.values[name](element, name);
     if (t.names[name]) name = t.names[name];
     if (name.include(':')) {
       return (!element.attributes || !element.attributes[name]) ? null :
        element.attributes[name].value;
     }
   }
   return element.getAttribute(name);
 },

 writeAttribute: function(element, name, value) {
   element = $(element);
   var attributes = { }, t = Element._attributeTranslations.write;

   if (typeof name == 'object') attributes = name;
   else attributes[name] = Object.isUndefined(value) ? true : value;

   for (var attr in attributes) {
     name = t.names[attr] || attr;
     value = attributes[attr];
     if (t.values[attr]) name = t.values[attr](element, value);
     if (value === false || value === null)
       element.removeAttribute(name);
     else if (value === true)
       element.setAttribute(name, name);
     else element.setAttribute(name, value);
   }
   return element;
 },

 getHeight: function(element) {
   return $(element).getDimensions().height;
 },

 getWidth: function(element) {
   return $(element).getDimensions().width;
 },

 classNames: function(element) {
   return new Element.ClassNames(element);
 },

 hasClassName: function(element, className) {
   if (!(element = $(element))) return;
   var elementClassName = element.className;
   return (elementClassName.length > 0 && (elementClassName == className ||
     new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
 },

 addClassName: function(element, className) {
   if (!(element = $(element))) return;
   if (!element.hasClassName(className))
     element.className += (element.className ? ' ' : '') + className;
   return element;
 },

 removeClassName: function(element, className) {
   if (!(element = $(element))) return;
   element.className = element.className.replace(
     new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
   return element;
 },

 toggleClassName: function(element, className) {
   if (!(element = $(element))) return;
   return element[element.hasClassName(className) ?
     'removeClassName' : 'addClassName'](className);
 },

 // removes whitespace-only text node children
 cleanWhitespace: function(element) {
   element = $(element);
   var node = element.firstChild;
   while (node) {
     var nextNode = node.nextSibling;
     if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
       element.removeChild(node);
     node = nextNode;
   }
   return element;
 },

 empty: function(element) {
   return $(element).innerHTML.blank();
 },

 descendantOf: function(element, ancestor) {
   element = $(element), ancestor = $(ancestor);

   if (element.compareDocumentPosition)
     return (element.compareDocumentPosition(ancestor) & 8) === 8;

   if (ancestor.contains)
     return ancestor.contains(element) && ancestor !== element;

   while (element = element.parentNode)
     if (element == ancestor) return true;

   return false;
 },

 scrollTo: function(element) {
   element = $(element);
   var pos = element.cumulativeOffset();
   window.scrollTo(pos[0], pos[1]);
   return element;
 },

 getStyle: function(element, style) {
   element = $(element);
   style = style == 'float' ? 'cssFloat' : style.camelize();
   var value = element.style[style];
   if (!value || value == 'auto') {
     var css = document.defaultView.getComputedStyle(element, null);
     value = css ? css[style] : null;
   }
   if (style == 'opacity') return value ? parseFloat(value) : 1.0;
   return value == 'auto' ? null : value;
 },

 getOpacity: function(element) {
   return $(element).getStyle('opacity');
 },

 setStyle: function(element, styles) {
   element = $(element);
   var elementStyle = element.style, match;
   if (Object.isString(styles)) {
     element.style.cssText += ';' + styles;
     return styles.include('opacity') ?
       element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
   }
   for (var property in styles)
     if (property == 'opacity') element.setOpacity(styles[property]);
     else
       elementStyle[(property == 'float' || property == 'cssFloat') ?
         (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
           property] = styles[property];

   return element;
 },

 setOpacity: function(element, value) {
   element = $(element);
   element.style.opacity = (value == 1 || value === '') ? '' :
     (value < 0.00001) ? 0 : value;
   return element;
 },

 getDimensions: function(element) {
   element = $(element);
   var display = element.getStyle('display');
   if (display != 'none' && display != null) // Safari bug
     return {width: element.offsetWidth, height: element.offsetHeight};

   // All *Width and *Height properties give 0 on elements with display none,
   // so enable the element temporarily
   var els = element.style;
   var originalVisibility = els.visibility;
   var originalPosition = els.position;
   var originalDisplay = els.display;
   els.visibility = 'hidden';
   els.position = 'absolute';
   els.display = 'block';
   var originalWidth = element.clientWidth;
   var originalHeight = element.clientHeight;
   els.display = originalDisplay;
   els.position = originalPosition;
   els.visibility = originalVisibility;
   return {width: originalWidth, height: originalHeight};
 },

 makePositioned: function(element) {
   element = $(element);
   var pos = Element.getStyle(element, 'position');
   if (pos == 'static' || !pos) {
     element._madePositioned = true;
     element.style.position = 'relative';
     // Opera returns the offset relative to the positioning context, when an
     // element is position relative but top and left have not been defined
     if (Prototype.Browser.Opera) {
       element.style.top = 0;
       element.style.left = 0;
     }
   }
   return element;
 },

 undoPositioned: function(element) {
   element = $(element);
   if (element._madePositioned) {
     element._madePositioned = undefined;
     element.style.position =
       element.style.top =
       element.style.left =
       element.style.bottom =
       element.style.right = '';
   }
   return element;
 },

 makeClipping: function(element) {
   element = $(element);
   if (element._overflow) return element;
   element._overflow = Element.getStyle(element, 'overflow') || 'auto';
   if (element._overflow !== 'hidden')
     element.style.overflow = 'hidden';
   return element;
 },

 undoClipping: function(element) {
   element = $(element);
   if (!element._overflow) return element;
   element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
   element._overflow = null;
   return element;
 },

 cumulativeOffset: function(element) {
   var valueT = 0, valueL = 0;
   do {
     valueT += element.offsetTop  || 0;
     valueL += element.offsetLeft || 0;
     element = element.offsetParent;
   } while (element);
   return Element._returnOffset(valueL, valueT);
 },

 positionedOffset: function(element) {
   var valueT = 0, valueL = 0;
   do {
     valueT += element.offsetTop  || 0;
     valueL += element.offsetLeft || 0;
     element = element.offsetParent;
     if (element) {
       if (element.tagName.toUpperCase() == 'BODY') break;
       var p = Element.getStyle(element, 'position');
       if (p !== 'static') break;
     }
   } while (element);
   return Element._returnOffset(valueL, valueT);
 },

 absolutize: function(element) {
   element = $(element);
   if (element.getStyle('position') == 'absolute') return element;
   // Position.prepare(); // To be done manually by Scripty when it needs it.

   var offsets = element.positionedOffset();
   var top     = offsets[1];
   var left    = offsets[0];
   var width   = element.clientWidth;
   var height  = element.clientHeight;

   element._originalLeft   = left - parseFloat(element.style.left  || 0);
   element._originalTop    = top  - parseFloat(element.style.top || 0);
   element._originalWidth  = element.style.width;
   element._originalHeight = element.style.height;

   element.style.position = 'absolute';
   element.style.top    = top + 'px';
   element.style.left   = left + 'px';
   element.style.width  = width + 'px';
   element.style.height = height + 'px';
   return element;
 },

 relativize: function(element) {
   element = $(element);
   if (element.getStyle('position') == 'relative') return element;
   // Position.prepare(); // To be done manually by Scripty when it needs it.

   element.style.position = 'relative';
   var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
   var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

   element.style.top    = top + 'px';
   element.style.left   = left + 'px';
   element.style.height = element._originalHeight;
   element.style.width  = element._originalWidth;
   return element;
 },

 cumulativeScrollOffset: function(element) {
   var valueT = 0, valueL = 0;
   do {
     valueT += element.scrollTop  || 0;
     valueL += element.scrollLeft || 0;
     element = element.parentNode;
   } while (element);
   return Element._returnOffset(valueL, valueT);
 },

 getOffsetParent: function(element) {
   if (element.offsetParent) return $(element.offsetParent);
   if (element == document.body) return $(element);

   while ((element = element.parentNode) && element != document.body)
     if (Element.getStyle(element, 'position') != 'static')
       return $(element);

   return $(document.body);
 },

 viewportOffset: function(forElement) {
   var valueT = 0, valueL = 0;

   var element = forElement;
   do {
     valueT += element.offsetTop  || 0;
     valueL += element.offsetLeft || 0;

     // Safari fix
     if (element.offsetParent == document.body &&
       Element.getStyle(element, 'position') == 'absolute') break;

   } while (element = element.offsetParent);

   element = forElement;
   do {
     if (!Prototype.Browser.Opera || (element.tagName && (element.tagName.toUpperCase() == 'BODY'))) {
       valueT -= element.scrollTop  || 0;
       valueL -= element.scrollLeft || 0;
     }
   } while (element = element.parentNode);

   return Element._returnOffset(valueL, valueT);
 },

 clonePosition: function(element, source) {
   var options = Object.extend({
     setLeft:    true,
     setTop:     true,
     setWidth:   true,
     setHeight:  true,
     offsetTop:  0,
     offsetLeft: 0
   }, arguments[2] || { });

   // find page position of source
   source = $(source);
   var p = source.viewportOffset();

   // find coordinate system to use
   element = $(element);
   var delta = [0, 0];
   var parent = null;
   // delta [0,0] will do fine with position: fixed elements,
   // position:absolute needs offsetParent deltas
   if (Element.getStyle(element, 'position') == 'absolute') {
     parent = element.getOffsetParent();
     delta = parent.viewportOffset();
   }

   // correct by body offsets (fixes Safari)
   if (parent == document.body) {
     delta[0] -= document.body.offsetLeft;
     delta[1] -= document.body.offsetTop;
   }

   // set position
   if (options.setLeft)   element.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';
   if (options.setTop)    element.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';
   if (options.setWidth)  element.style.width = source.offsetWidth + 'px';
   if (options.setHeight) element.style.height = source.offsetHeight + 'px';
   return element;
 }
};

Element.Methods.identify.counter = 1;

Object.extend(Element.Methods, {
 getElementsBySelector: Element.Methods.select,
 childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
 write: {
   names: {
     className: 'class',
     htmlFor:   'for'
   },
   values: { }
 }
};

if (Prototype.Browser.Opera) {
 Element.Methods.getStyle = Element.Methods.getStyle.wrap(
   function(proceed, element, style) {
     switch (style) {
       case 'left': case 'top': case 'right': case 'bottom':
         if (proceed(element, 'position') === 'static') return null;
       case 'height': case 'width':
         // returns '0px' for hidden elements; we want it to return null
         if (!Element.visible(element)) return null;

         // returns the border-box dimensions rather than the content-box
         // dimensions, so we subtract padding and borders from the value
         var dim = parseInt(proceed(element, style), 10);

         if (dim !== element['offset' + style.capitalize()])
           return dim + 'px';

         var properties;
         if (style === 'height') {
           properties = ['border-top-width', 'padding-top',
            'padding-bottom', 'border-bottom-width'];
         }
         else {
           properties = ['border-left-width', 'padding-left',
            'padding-right', 'border-right-width'];
         }
         return properties.inject(dim, function(memo, property) {
           var val = proceed(element, property);
           return val === null ? memo : memo - parseInt(val, 10);
         }) + 'px';
       default: return proceed(element, style);
     }
   }
 );

 Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
   function(proceed, element, attribute) {
     if (attribute === 'title') return element.title;
     return proceed(element, attribute);
   }
 );
}

else if (Prototype.Browser.IE) {
 // IE doesn't report offsets correctly for static elements, so we change them
 // to "relative" to get the values, then change them back.
 Element.Methods.getOffsetParent = Element.Methods.getOffsetParent.wrap(
   function(proceed, element) {
     element = $(element);
     // IE throws an error if element is not in document
     try { element.offsetParent }
     catch(e) { return $(document.body) }
     var position = element.getStyle('position');
     if (position !== 'static') return proceed(element);
     element.setStyle({ position: 'relative' });
     var value = proceed(element);
     element.setStyle({ position: position });
     return value;
   }
 );

 $w('positionedOffset viewportOffset').each(function(method) {
   Element.Methods[method] = Element.Methods[method].wrap(
     function(proceed, element) {
       element = $(element);
       try { element.offsetParent }
       catch(e) { return Element._returnOffset(0,0) }
       var position = element.getStyle('position');
       if (position !== 'static') return proceed(element);
       // Trigger hasLayout on the offset parent so that IE6 reports
       // accurate offsetTop and offsetLeft values for position: fixed.
       var offsetParent = element.getOffsetParent();
       if (offsetParent && offsetParent.getStyle('position') === 'fixed')
         offsetParent.setStyle({ zoom: 1 });
       element.setStyle({ position: 'relative' });
       var value = proceed(element);
       element.setStyle({ position: position });
       return value;
     }
   );
 });

 Element.Methods.cumulativeOffset = Element.Methods.cumulativeOffset.wrap(
   function(proceed, element) {
     try { element.offsetParent }
     catch(e) { return Element._returnOffset(0,0) }
     return proceed(element);
   }
 );

 Element.Methods.getStyle = function(element, style) {
   element = $(element);
   style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
   var value = element.style[style];
   if (!value && element.currentStyle) value = element.currentStyle[style];

   if (style == 'opacity') {
     if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
       if (value[1]) return parseFloat(value[1]) / 100;
     return 1.0;
   }

   if (value == 'auto') {
     if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
       return element['offset' + style.capitalize()] + 'px';
     return null;
   }
   return value;
 };

 Element.Methods.setOpacity = function(element, value) {
   function stripAlpha(filter){
     return filter.replace(/alpha\([^\)]*\)/gi,'');
   }
   element = $(element);
   var currentStyle = element.currentStyle;
   if ((currentStyle && !currentStyle.hasLayout) ||
     (!currentStyle && element.style.zoom == 'normal'))
       element.style.zoom = 1;

   var filter = element.getStyle('filter'), style = element.style;
   if (value == 1 || value === '') {
     (filter = stripAlpha(filter)) ?
       style.filter = filter : style.removeAttribute('filter');
     return element;
   } else if (value < 0.00001) value = 0;
   style.filter = stripAlpha(filter) +
     'alpha(opacity=' + (value * 100) + ')';
   return element;
 };

 Element._attributeTranslations = {
   read: {
     names: {
       'class': 'className',
       'for':   'htmlFor'
     },
     values: {
       _getAttr: function(element, attribute) {
         return element.getAttribute(attribute, 2);
       },
       _getAttrNode: function(element, attribute) {
         var node = element.getAttributeNode(attribute);
         return node ? node.value : "";
       },
       _getEv: function(element, attribute) {
         attribute = element.getAttribute(attribute);
         return attribute ? attribute.toString().slice(23, -2) : null;
       },
       _flag: function(element, attribute) {
         return $(element).hasAttribute(attribute) ? attribute : null;
       },
       style: function(element) {
         return element.style.cssText.toLowerCase();
       },
       title: function(element) {
         return element.title;
       }
     }
   }
 };

 Element._attributeTranslations.write = {
   names: Object.extend({
     cellpadding: 'cellPadding',
     cellspacing: 'cellSpacing'
   }, Element._attributeTranslations.read.names),
   values: {
     checked: function(element, value) {
       element.checked = !!value;
     },

     style: function(element, value) {
       element.style.cssText = value ? value : '';
     }
   }
 };

 Element._attributeTranslations.has = {};

 $w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
     'encType maxLength readOnly longDesc frameBorder').each(function(attr) {
   Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
   Element._attributeTranslations.has[attr.toLowerCase()] = attr;
 });

 (function(v) {
   Object.extend(v, {
     href:        v._getAttr,
     src:         v._getAttr,
     type:        v._getAttr,
     action:      v._getAttrNode,
     disabled:    v._flag,
     checked:     v._flag,
     readonly:    v._flag,
     multiple:    v._flag,
     onload:      v._getEv,
     onunload:    v._getEv,
     onclick:     v._getEv,
     ondblclick:  v._getEv,
     onmousedown: v._getEv,
     onmouseup:   v._getEv,
     onmouseover: v._getEv,
     onmousemove: v._getEv,
     onmouseout:  v._getEv,
     onfocus:     v._getEv,
     onblur:      v._getEv,
     onkeypress:  v._getEv,
     onkeydown:   v._getEv,
     onkeyup:     v._getEv,
     onsubmit:    v._getEv,
     onreset:     v._getEv,
     onselect:    v._getEv,
     onchange:    v._getEv
   });
 })(Element._attributeTranslations.read.values);
}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
 Element.Methods.setOpacity = function(element, value) {
   element = $(element);
   element.style.opacity = (value == 1) ? 0.999999 :
     (value === '') ? '' : (value < 0.00001) ? 0 : value;
   return element;
 };
}

else if (Prototype.Browser.WebKit) {
 Element.Methods.setOpacity = function(element, value) {
   element = $(element);
   element.style.opacity = (value == 1 || value === '') ? '' :
     (value < 0.00001) ? 0 : value;

   if (value == 1)
     if(element.tagName.toUpperCase() == 'IMG' && element.width) {
       element.width++; element.width--;
     } else try {
       var n = document.createTextNode(' ');
       element.appendChild(n);
       element.removeChild(n);
     } catch (e) { }

   return element;
 };

 // Safari returns margins on body which is incorrect if the child is absolutely
 // positioned.  For performance reasons, redefine Element#cumulativeOffset for
 // KHTML/WebKit only.
 Element.Methods.cumulativeOffset = function(element) {
   var valueT = 0, valueL = 0;
   do {
     valueT += element.offsetTop  || 0;
     valueL += element.offsetLeft || 0;
     if (element.offsetParent == document.body)
       if (Element.getStyle(element, 'position') == 'absolute') break;

     element = element.offsetParent;
   } while (element);

   return Element._returnOffset(valueL, valueT);
 };
}

if (Prototype.Browser.IE || Prototype.Browser.Opera) {
 // IE and Opera are missing .innerHTML support for TABLE-related and SELECT elements
 Element.Methods.update = function(element, content) {
   element = $(element);

   if (content && content.toElement) content = content.toElement();
   if (Object.isElement(content)) return element.update().insert(content);

   content = Object.toHTML(content);
   var tagName = element.tagName.toUpperCase();

   if (tagName in Element._insertionTranslations.tags) {
     $A(element.childNodes).each(function(node) { element.removeChild(node) });
     Element._getContentFromAnonymousElement(tagName, content.stripScripts())
       .each(function(node) { element.appendChild(node) });
   }
   else element.innerHTML = content.stripScripts();

   content.evalScripts.bind(content).defer();
   return element;
 };
}

if ('outerHTML' in document.createElement('div')) {
 Element.Methods.replace = function(element, content) {
   element = $(element);

   if (content && content.toElement) content = content.toElement();
   if (Object.isElement(content)) {
     element.parentNode.replaceChild(content, element);
     return element;
   }

   content = Object.toHTML(content);
   var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

   if (Element._insertionTranslations.tags[tagName]) {
     var nextSibling = element.next();
     var fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
     parent.removeChild(element);
     if (nextSibling)
       fragments.each(function(node) { parent.insertBefore(node, nextSibling) });
     else
       fragments.each(function(node) { parent.appendChild(node) });
   }
   else element.outerHTML = content.stripScripts();

   content.evalScripts.bind(content).defer();
   return element;
 };
}

Element._returnOffset = function(l, t) {
 var result = [l, t];
 result.left = l;
 result.top = t;
 return result;
};

Element._getContentFromAnonymousElement = function(tagName, html) {
 var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
 if (t) {
   div.innerHTML = t[0] + html + t[1];
   t[2].times(function() { div = div.firstChild });
 } else div.innerHTML = html;
 return $A(div.childNodes);
};

Element._insertionTranslations = {
 before: function(element, node) {
   element.parentNode.insertBefore(node, element);
 },
 top: function(element, node) {
   element.insertBefore(node, element.firstChild);
 },
 bottom: function(element, node) {
   element.appendChild(node);
 },
 after: function(element, node) {
   element.parentNode.insertBefore(node, element.nextSibling);
 },
 tags: {
   TABLE:  ['<table>',                '</table>',                   1],
   TBODY:  ['<table><tbody>',         '</tbody></table>',           2],
   TR:     ['<table><tbody><tr>',     '</tr></tbody></table>',      3],
   TD:     ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
   SELECT: ['<select>',               '</select>',                  1]
 }
};

(function() {
 Object.extend(this.tags, {
   THEAD: this.tags.TBODY,
   TFOOT: this.tags.TBODY,
   TH:    this.tags.TD
 });
}).call(Element._insertionTranslations);

Element.Methods.Simulated = {
 hasAttribute: function(element, attribute) {
   attribute = Element._attributeTranslations.has[attribute] || attribute;
   var node = $(element).getAttributeNode(attribute);
   return !!(node && node.specified);
 }
};

Element.Methods.ByTag = { };

Object.extend(Element, Element.Methods);

if (!Prototype.BrowserFeatures.ElementExtensions &&
   document.createElement('div')['__proto__']) {
 window.HTMLElement = { };
 window.HTMLElement.prototype = document.createElement('div')['__proto__'];
 Prototype.BrowserFeatures.ElementExtensions = true;
}

Element.extend = (function() {
 if (Prototype.BrowserFeatures.SpecificElementExtensions)
   return Prototype.K;

 var Methods = { }, ByTag = Element.Methods.ByTag;

 var extend = Object.extend(function(element) {
   if (!element || element._extendedByPrototype ||
       element.nodeType != 1 || element == window) return element;

   var methods = Object.clone(Methods),
     tagName = element.tagName.toUpperCase(), property, value;

   // extend methods for specific tags
   if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

   for (property in methods) {
     value = methods[property];
     if (Object.isFunction(value) && !(property in element))
       element[property] = value.methodize();
   }

   element._extendedByPrototype = Prototype.emptyFunction;
   return element;

 }, {
   refresh: function() {
     // extend methods for all tags (Safari doesn't need this)
     if (!Prototype.BrowserFeatures.ElementExtensions) {
       Object.extend(Methods, Element.Methods);
       Object.extend(Methods, Element.Methods.Simulated);
     }
   }
 });

 extend.refresh();
 return extend;
})();

Element.hasAttribute = function(element, attribute) {
 if (element.hasAttribute) return element.hasAttribute(attribute);
 return Element.Methods.Simulated.hasAttribute(element, attribute);
};

Element.addMethods = function(methods) {
 var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

 if (!methods) {
   Object.extend(Form, Form.Methods);
   Object.extend(Form.Element, Form.Element.Methods);
   Object.extend(Element.Methods.ByTag, {
     "FORM":     Object.clone(Form.Methods),
     "INPUT":    Object.clone(Form.Element.Methods),
     "SELECT":   Object.clone(Form.Element.Methods),
     "TEXTAREA": Object.clone(Form.Element.Methods)
   });
 }

 if (arguments.length == 2) {
   var tagName = methods;
   methods = arguments[1];
 }

 if (!tagName) Object.extend(Element.Methods, methods || { });
 else {
   if (Object.isArray(tagName)) tagName.each(extend);
   else extend(tagName);
 }

 function extend(tagName) {
   tagName = tagName.toUpperCase();
   if (!Element.Methods.ByTag[tagName])
     Element.Methods.ByTag[tagName] = { };
   Object.extend(Element.Methods.ByTag[tagName], methods);
 }

 function copy(methods, destination, onlyIfAbsent) {
   onlyIfAbsent = onlyIfAbsent || false;
   for (var property in methods) {
     var value = methods[property];
     if (!Object.isFunction(value)) continue;
     if (!onlyIfAbsent || !(property in destination))
       destination[property] = value.methodize();
   }
 }

 function findDOMClass(tagName) {
   var klass;
   var trans = {
     "OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
     "FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
     "DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
     "H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
     "INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
     "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
     "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
     "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
     "FrameSet", "IFRAME": "IFrame"
   };
   if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
   if (window[klass]) return window[klass];
   klass = 'HTML' + tagName + 'Element';
   if (window[klass]) return window[klass];
   klass = 'HTML' + tagName.capitalize() + 'Element';
   if (window[klass]) return window[klass];

   window[klass] = { };
   window[klass].prototype = document.createElement(tagName)['__proto__'];
   return window[klass];
 }

 if (F.ElementExtensions) {
   copy(Element.Methods, HTMLElement.prototype);
   copy(Element.Methods.Simulated, HTMLElement.prototype, true);
 }

 if (F.SpecificElementExtensions) {
   for (var tag in Element.Methods.ByTag) {
     var klass = findDOMClass(tag);
     if (Object.isUndefined(klass)) continue;
     copy(T[tag], klass.prototype);
   }
 }

 Object.extend(Element, Element.Methods);
 delete Element.ByTag;

 if (Element.extend.refresh) Element.extend.refresh();
 Element.cache = { };
};

document.viewport = {
 getDimensions: function() {
   var dimensions = { }, B = Prototype.Browser;
   $w('width height').each(function(d) {
     var D = d.capitalize();
     if (B.WebKit && !document.evaluate) {
       // Safari <3.0 needs self.innerWidth/Height
       dimensions[d] = self['inner' + D];
     } else if (B.Opera && parseFloat(window.opera.version()) < 9.5) {
       // Opera <9.5 needs document.body.clientWidth/Height
       dimensions[d] = document.body['client' + D]
     } else {
       dimensions[d] = document.documentElement['client' + D];
     }
   });
   return dimensions;
 },

 getWidth: function() {
   return this.getDimensions().width;
 },

 getHeight: function() {
   return this.getDimensions().height;
 },

 getScrollOffsets: function() {
   return Element._returnOffset(
     window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
     window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
 }
};
/* Portions of the Selector class are derived from Jack Slocum's DomQuery,
* part of YUI-Ext version 0.40, distributed under the terms of an MIT-style
* license.  Please see http://www.yui-ext.com/ for more information. */

var Selector = Class.create({
 initialize: function(expression) {
   this.expression = expression.strip();

   if (this.shouldUseSelectorsAPI()) {
     this.mode = 'selectorsAPI';
   } else if (this.shouldUseXPath()) {
     this.mode = 'xpath';
     this.compileXPathMatcher();
   } else {
     this.mode = "normal";
     this.compileMatcher();
   }

 },

 shouldUseXPath: function() {
   if (!Prototype.BrowserFeatures.XPath) return false;

   var e = this.expression;

   // Safari 3 chokes on :*-of-type and :empty
   if (Prototype.Browser.WebKit &&
    (e.include("-of-type") || e.include(":empty")))
     return false;

   // XPath can't do namespaced attributes, nor can it read
   // the "checked" property from DOM nodes
   if ((/(\[[\w-]*?:|:checked)/).test(e))
     return false;

   return true;
 },

 shouldUseSelectorsAPI: function() {
   if (!Prototype.BrowserFeatures.SelectorsAPI) return false;

   if (!Selector._div) Selector._div = new Element('div');

   // Make sure the browser treats the selector as valid. Test on an
   // isolated element to minimize cost of this check.
   try {
     Selector._div.querySelector(this.expression);
   } catch(e) {
     return false;
   }

   return true;
 },

 compileMatcher: function() {
   var e = this.expression, ps = Selector.patterns, h = Selector.handlers,
       c = Selector.criteria, le, p, m;

   if (Selector._cache[e]) {
     this.matcher = Selector._cache[e];
     return;
   }

   this.matcher = ["this.matcher = function(root) {",
                   "var r = root, h = Selector.handlers, c = false, n;"];

   while (e && le != e && (/\S/).test(e)) {
     le = e;
     for (var i in ps) {
       p = ps[i];
       if (m = e.match(p)) {
         this.matcher.push(Object.isFunction(c[i]) ? c[i](m) :
           new Template(c[i]).evaluate(m));
         e = e.replace(m[0], '');
         break;
       }
     }
   }

   this.matcher.push("return h.unique(n);\n}");
   eval(this.matcher.join('\n'));
   Selector._cache[this.expression] = this.matcher;
 },

 compileXPathMatcher: function() {
   var e = this.expression, ps = Selector.patterns,
       x = Selector.xpath, le, m;

   if (Selector._cache[e]) {
     this.xpath = Selector._cache[e]; return;
   }

   this.matcher = ['.//*'];
   while (e && le != e && (/\S/).test(e)) {
     le = e;
     for (var i in ps) {
       if (m = e.match(ps[i])) {
         this.matcher.push(Object.isFunction(x[i]) ? x[i](m) :
           new Template(x[i]).evaluate(m));
         e = e.replace(m[0], '');
         break;
       }
     }
   }

   this.xpath = this.matcher.join('');
   Selector._cache[this.expression] = this.xpath;
 },

 findElements: function(root) {
   root = root || document;
   var e = this.expression, results;

   switch (this.mode) {
     case 'selectorsAPI':
       // querySelectorAll queries document-wide, then filters to descendants
       // of the context element. That's not what we want.
       // Add an explicit context to the selector if necessary.
       if (root !== document) {
         var oldId = root.id, id = $(root).identify();
         e = "#" + id + " " + e;
       }

       results = $A(root.querySelectorAll(e)).map(Element.extend);
       root.id = oldId;

       return results;
     case 'xpath':
       return document._getElementsByXPath(this.xpath, root);
     default:
      return this.matcher(root);
   }
 },

 match: function(element) {
   this.tokens = [];

   var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
   var le, p, m;

   while (e && le !== e && (/\S/).test(e)) {
     le = e;
     for (var i in ps) {
       p = ps[i];
       if (m = e.match(p)) {
         // use the Selector.assertions methods unless the selector
         // is too complex.
         if (as[i]) {
           this.tokens.push([i, Object.clone(m)]);
           e = e.replace(m[0], '');
         } else {
           // reluctantly do a document-wide search
           // and look for a match in the array
           return this.findElements(document).include(element);
         }
       }
     }
   }

   var match = true, name, matches;
   for (var i = 0, token; token = this.tokens[i]; i++) {
     name = token[0], matches = token[1];
     if (!Selector.assertions[name](element, matches)) {
       match = false; break;
     }
   }

   return match;
 },

 toString: function() {
   return this.expression;
 },

 inspect: function() {
   return "#<Selector:" + this.expression.inspect() + ">";
 }
});

Object.extend(Selector, {
 _cache: { },

 xpath: {
   descendant:   "//*",
   child:        "/*",
   adjacent:     "/following-sibling::*[1]",
   laterSibling: '/following-sibling::*',
   tagName:      function(m) {
     if (m[1] == '*') return '';
     return "[local-name()='" + m[1].toLowerCase() +
            "' or local-name()='" + m[1].toUpperCase() + "']";
   },
   className:    "[contains(concat(' ', @class, ' '), ' #{1} ')]",
   id:           "[@id='#{1}']",
   attrPresence: function(m) {
     m[1] = m[1].toLowerCase();
     return new Template("[@#{1}]").evaluate(m);
   },
   attr: function(m) {
     m[1] = m[1].toLowerCase();
     m[3] = m[5] || m[6];
     return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
   },
   pseudo: function(m) {
     var h = Selector.xpath.pseudos[m[1]];
     if (!h) return '';
     if (Object.isFunction(h)) return h(m);
     return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
   },
   operators: {
     '=':  "[@#{1}='#{3}']",
     '!=': "[@#{1}!='#{3}']",
     '^=': "[starts-with(@#{1}, '#{3}')]",
     '$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
     '*=': "[contains(@#{1}, '#{3}')]",
     '~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
     '|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
   },
   pseudos: {
     'first-child': '[not(preceding-sibling::*)]',
     'last-child':  '[not(following-sibling::*)]',
     'only-child':  '[not(preceding-sibling::* or following-sibling::*)]',
     'empty':       "[count(*) = 0 and (count(text()) = 0)]",
     'checked':     "[@checked]",
     'disabled':    "[(@disabled) and (@type!='hidden')]",
     'enabled':     "[not(@disabled) and (@type!='hidden')]",
     'not': function(m) {
       var e = m[6], p = Selector.patterns,
           x = Selector.xpath, le, v;

       var exclusion = [];
       while (e && le != e && (/\S/).test(e)) {
         le = e;
         for (var i in p) {
           if (m = e.match(p[i])) {
             v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
             exclusion.push("(" + v.substring(1, v.length - 1) + ")");
             e = e.replace(m[0], '');
             break;
           }
         }
       }
       return "[not(" + exclusion.join(" and ") + ")]";
     },
     'nth-child':      function(m) {
       return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
     },
     'nth-last-child': function(m) {
       return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
     },
     'nth-of-type':    function(m) {
       return Selector.xpath.pseudos.nth("position() ", m);
     },
     'nth-last-of-type': function(m) {
       return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
     },
     'first-of-type':  function(m) {
       m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
     },
     'last-of-type':   function(m) {
       m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
     },
     'only-of-type':   function(m) {
       var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
     },
     nth: function(fragment, m) {
       var mm, formula = m[6], predicate;
       if (formula == 'even') formula = '2n+0';
       if (formula == 'odd')  formula = '2n+1';
       if (mm = formula.match(/^(\d+)$/)) // digit only
         return '[' + fragment + "= " + mm[1] + ']';
       if (mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
         if (mm[1] == "-") mm[1] = -1;
         var a = mm[1] ? Number(mm[1]) : 1;
         var b = mm[2] ? Number(mm[2]) : 0;
         predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " +
         "((#{fragment} - #{b}) div #{a} >= 0)]";
         return new Template(predicate).evaluate({
           fragment: fragment, a: a, b: b });
       }
     }
   }
 },

 criteria: {
   tagName:      'n = h.tagName(n, r, "#{1}", c);      c = false;',
   className:    'n = h.className(n, r, "#{1}", c);    c = false;',
   id:           'n = h.id(n, r, "#{1}", c);           c = false;',
   attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
   attr: function(m) {
     m[3] = (m[5] || m[6]);
     return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
   },
   pseudo: function(m) {
     if (m[6]) m[6] = m[6].replace(/"/g, '\\"');
     return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
   },
   descendant:   'c = "descendant";',
   child:        'c = "child";',
   adjacent:     'c = "adjacent";',
   laterSibling: 'c = "laterSibling";'
 },

 patterns: {
   // combinators must be listed first
   // (and descendant needs to be last combinator)
   laterSibling: /^\s*~\s*/,
   child:        /^\s*>\s*/,
   adjacent:     /^\s*\+\s*/,
   descendant:   /^\s/,

   // selectors follow
   tagName:      /^\s*(\*|[\w\-]+)(\b|$)?/,
   id:           /^#([\w\-\*]+)(\b|$)/,
   className:    /^\.([\w\-\*]+)(\b|$)/,
   pseudo:
/^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
   attrPresence: /^\[((?:[\w]+:)?[\w]+)\]/,
   attr:         /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
 },

 // for Selector.match and Element#match
 assertions: {
   tagName: function(element, matches) {
     return matches[1].toUpperCase() == element.tagName.toUpperCase();
   },

   className: function(element, matches) {
     return Element.hasClassName(element, matches[1]);
   },

   id: function(element, matches) {
     return element.id === matches[1];
   },

   attrPresence: function(element, matches) {
     return Element.hasAttribute(element, matches[1]);
   },

   attr: function(element, matches) {
     var nodeValue = Element.readAttribute(element, matches[1]);
     return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
   }
 },

 handlers: {
   // UTILITY FUNCTIONS
   // joins two collections
   concat: function(a, b) {
     for (var i = 0, node; node = b[i]; i++)
       a.push(node);
     return a;
   },

   // marks an array of nodes for counting
   mark: function(nodes) {
     var _true = Prototype.emptyFunction;
     for (var i = 0, node; node = nodes[i]; i++)
       node._countedByPrototype = _true;
     return nodes;
   },

   unmark: function(nodes) {
     for (var i = 0, node; node = nodes[i]; i++)
       node._countedByPrototype = undefined;
     return nodes;
   },

   // mark each child node with its position (for nth calls)
   // "ofType" flag indicates whether we're indexing for nth-of-type
   // rather than nth-child
   index: function(parentNode, reverse, ofType) {
     parentNode._countedByPrototype = Prototype.emptyFunction;
     if (reverse) {
       for (var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--) {
         var node = nodes[i];
         if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
       }
     } else {
       for (var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
         if (node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
     }
   },

   // filters out duplicates and extends all nodes
   unique: function(nodes) {
     if (nodes.length == 0) return nodes;
     var results = [], n;
     for (var i = 0, l = nodes.length; i < l; i++)
       if (!(n = nodes[i])._countedByPrototype) {
         n._countedByPrototype = Prototype.emptyFunction;
         results.push(Element.extend(n));
       }
     return Selector.handlers.unmark(results);
   },

   // COMBINATOR FUNCTIONS
   descendant: function(nodes) {
     var h = Selector.handlers;
     for (var i = 0, results = [], node; node = nodes[i]; i++)
       h.concat(results, node.getElementsByTagName('*'));
     return results;
   },

   child: function(nodes) {
     var h = Selector.handlers;
     for (var i = 0, results = [], node; node = nodes[i]; i++) {
       for (var j = 0, child; child = node.childNodes[j]; j++)
         if (child.nodeType == 1 && child.tagName != '!') results.push(child);
     }
     return results;
   },

   adjacent: function(nodes) {
     for (var i = 0, results = [], node; node = nodes[i]; i++) {
       var next = this.nextElementSibling(node);
       if (next) results.push(next);
     }
     return results;
   },

   laterSibling: function(nodes) {
     var h = Selector.handlers;
     for (var i = 0, results = [], node; node = nodes[i]; i++)
       h.concat(results, Element.nextSiblings(node));
     return results;
   },

   nextElementSibling: function(node) {
     while (node = node.nextSibling)
       if (node.nodeType == 1) return node;
     return null;
   },

   previousElementSibling: function(node) {
     while (node = node.previousSibling)
       if (node.nodeType == 1) return node;
     return null;
   },

   // TOKEN FUNCTIONS
   tagName: function(nodes, root, tagName, combinator) {
     var uTagName = tagName.toUpperCase();
     var results = [], h = Selector.handlers;
     if (nodes) {
       if (combinator) {
         // fastlane for ordinary descendant combinators
         if (combinator == "descendant") {
           for (var i = 0, node; node = nodes[i]; i++)
             h.concat(results, node.getElementsByTagName(tagName));
           return results;
         } else nodes = this[combinator](nodes);
         if (tagName == "*") return nodes;
       }
       for (var i = 0, node; node = nodes[i]; i++)
         if (node.tagName.toUpperCase() === uTagName) results.push(node);
       return results;
     } else return root.getElementsByTagName(tagName);
   },

   id: function(nodes, root, id, combinator) {
     var targetNode = $(id), h = Selector.handlers;
     if (!targetNode) return [];
     if (!nodes && root == document) return [targetNode];
     if (nodes) {
       if (combinator) {
         if (combinator == 'child') {
           for (var i = 0, node; node = nodes[i]; i++)
             if (targetNode.parentNode == node) return [targetNode];
         } else if (combinator == 'descendant') {
           for (var i = 0, node; node = nodes[i]; i++)
             if (Element.descendantOf(targetNode, node)) return [targetNode];
         } else if (combinator == 'adjacent') {
           for (var i = 0, node; node = nodes[i]; i++)
             if (Selector.handlers.previousElementSibling(targetNode) == node)
               return [targetNode];
         } else nodes = h[combinator](nodes);
       }
       for (var i = 0, node; node = nodes[i]; i++)
         if (node == targetNode) return [targetNode];
       return [];
     }
     return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
   },

   className: function(nodes, root, className, combinator) {
     if (nodes && combinator) nodes = this[combinator](nodes);
     return Selector.handlers.byClassName(nodes, root, className);
   },

   byClassName: function(nodes, root, className) {
     if (!nodes) nodes = Selector.handlers.descendant([root]);
     var needle = ' ' + className + ' ';
     for (var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++) {
       nodeClassName = node.className;
       if (nodeClassName.length == 0) continue;
       if (nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
         results.push(node);
     }
     return results;
   },

   attrPresence: function(nodes, root, attr, combinator) {
     if (!nodes) nodes = root.getElementsByTagName("*");
     if (nodes && combinator) nodes = this[combinator](nodes);
     var results = [];
     for (var i = 0, node; node = nodes[i]; i++)
       if (Element.hasAttribute(node, attr)) results.push(node);
     return results;
   },

   attr: function(nodes, root, attr, value, operator, combinator) {
     if (!nodes) nodes = root.getElementsByTagName("*");
     if (nodes && combinator) nodes = this[combinator](nodes);
     var handler = Selector.operators[operator], results = [];
     for (var i = 0, node; node = nodes[i]; i++) {
       var nodeValue = Element.readAttribute(node, attr);
       if (nodeValue === null) continue;
       if (handler(nodeValue, value)) results.push(node);
     }
     return results;
   },

   pseudo: function(nodes, name, value, root, combinator) {
     if (nodes && combinator) nodes = this[combinator](nodes);
     if (!nodes) nodes = root.getElementsByTagName("*");
     return Selector.pseudos[name](nodes, value, root);
   }
 },

 pseudos: {
   'first-child': function(nodes, value, root) {
     for (var i = 0, results = [], node; node = nodes[i]; i++) {
       if (Selector.handlers.previousElementSibling(node)) continue;
         results.push(node);
     }
     return results;
   },
   'last-child': function(nodes, value, root) {
     for (var i = 0, results = [], node; node = nodes[i]; i++) {
       if (Selector.handlers.nextElementSibling(node)) continue;
         results.push(node);
     }
     return results;
   },
   'only-child': function(nodes, value, root) {
     var h = Selector.handlers;
     for (var i = 0, results = [], node; node = nodes[i]; i++)
       if (!h.previousElementSibling(node) && !h.nextElementSibling(node))
         results.push(node);
     return results;
   },
   'nth-child':        function(nodes, formula, root) {
     return Selector.pseudos.nth(nodes, formula, root);
   },
   'nth-last-child':   function(nodes, formula, root) {
     return Selector.pseudos.nth(nodes, formula, root, true);
   },
   'nth-of-type':      function(nodes, formula, root) {
     return Selector.pseudos.nth(nodes, formula, root, false, true);
   },
   'nth-last-of-type': function(nodes, formula, root) {
     return Selector.pseudos.nth(nodes, formula, root, true, true);
   },
   'first-of-type':    function(nodes, formula, root) {
     return Selector.pseudos.nth(nodes, "1", root, false, true);
   },
   'last-of-type':     function(nodes, formula, root) {
     return Selector.pseudos.nth(nodes, "1", root, true, true);
   },
   'only-of-type':     function(nodes, formula, root) {
     var p = Selector.pseudos;
     return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
   },

   // handles the an+b logic
   getIndices: function(a, b, total) {
     if (a == 0) return b > 0 ? [b] : [];
     return $R(1, total).inject([], function(memo, i) {
       if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
       return memo;
     });
   },

   // handles nth(-last)-child, nth(-last)-of-type, and (first|last)-of-type
   nth: function(nodes, formula, root, reverse, ofType) {
     if (nodes.length == 0) return [];
     if (formula == 'even') formula = '2n+0';
     if (formula == 'odd')  formula = '2n+1';
     var h = Selector.handlers, results = [], indexed = [], m;
     h.mark(nodes);
     for (var i = 0, node; node = nodes[i]; i++) {
       if (!node.parentNode._countedByPrototype) {
         h.index(node.parentNode, reverse, ofType);
         indexed.push(node.parentNode);
       }
     }
     if (formula.match(/^\d+$/)) { // just a number
       formula = Number(formula);
       for (var i = 0, node; node = nodes[i]; i++)
         if (node.nodeIndex == formula) results.push(node);
     } else if (m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/)) { // an+b
       if (m[1] == "-") m[1] = -1;
       var a = m[1] ? Number(m[1]) : 1;
       var b = m[2] ? Number(m[2]) : 0;
       var indices = Selector.pseudos.getIndices(a, b, nodes.length);
       for (var i = 0, node, l = indices.length; node = nodes[i]; i++) {
         for (var j = 0; j < l; j++)
           if (node.nodeIndex == indices[j]) results.push(node);
       }
     }
     h.unmark(nodes);
     h.unmark(indexed);
     return results;
   },

   'empty': function(nodes, value, root) {
     for (var i = 0, results = [], node; node = nodes[i]; i++) {
       // IE treats comments as element nodes
       if (node.tagName == '!' || node.firstChild) continue;
       results.push(node);
     }
     return results;
   },

   'not': function(nodes, selector, root) {
     var h = Selector.handlers, selectorType, m;
     var exclusions = new Selector(selector).findElements(root);
     h.mark(exclusions);
     for (var i = 0, results = [], node; node = nodes[i]; i++)
       if (!node._countedByPrototype) results.push(node);
     h.unmark(exclusions);
     return results;
   },

   'enabled': function(nodes, value, root) {
     for (var i = 0, results = [], node; node = nodes[i]; i++)
       if (!node.disabled && (!node.type || node.type !== 'hidden'))
         results.push(node);
     return results;
   },

   'disabled': function(nodes, value, root) {
     for (var i = 0, results = [], node; node = nodes[i]; i++)
       if (node.disabled) results.push(node);
     return results;
   },

   'checked': function(nodes, value, root) {
     for (var i = 0, results = [], node; node = nodes[i]; i++)
       if (node.checked) results.push(node);
     return results;
   }
 },

 operators: {
   '=':  function(nv, v) { return nv == v; },
   '!=': function(nv, v) { return nv != v; },
   '^=': function(nv, v) { return nv == v || nv && nv.startsWith(v); },
   '$=': function(nv, v) { return nv == v || nv && nv.endsWith(v); },
   '*=': function(nv, v) { return nv == v || nv && nv.include(v); },
   '$=': function(nv, v) { return nv.endsWith(v); },
   '*=': function(nv, v) { return nv.include(v); },
   '~=': function(nv, v) { return (' ' + nv + ' ').include(' ' + v + ' '); },
   '|=': function(nv, v) { return ('-' + (nv || "").toUpperCase() +
    '-').include('-' + (v || "").toUpperCase() + '-'); }
 },

 split: function(expression) {
   var expressions = [];
   expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m) {
     expressions.push(m[1].strip());
   });
   return expressions;
 },

 matchElements: function(elements, expression) {
   var matches = $$(expression), h = Selector.handlers;
   h.mark(matches);
   for (var i = 0, results = [], element; element = elements[i]; i++)
     if (element._countedByPrototype) results.push(element);
   h.unmark(matches);
   return results;
 },

 findElement: function(elements, expression, index) {
   if (Object.isNumber(expression)) {
     index = expression; expression = false;
   }
   return Selector.matchElements(elements, expression || '*')[index || 0];
 },

 findChildElements: function(element, expressions) {
   expressions = Selector.split(expressions.join(','));
   var results = [], h = Selector.handlers;
   for (var i = 0, l = expressions.length, selector; i < l; i++) {
     selector = new Selector(expressions[i].strip());
     h.concat(results, selector.findElements(element));
   }
   return (l > 1) ? h.unique(results) : results;
 }
});

if (Prototype.Browser.IE) {
 Object.extend(Selector.handlers, {
   // IE returns comment nodes on getElementsByTagName("*").
   // Filter them out.
   concat: function(a, b) {
     for (var i = 0, node; node = b[i]; i++)
       if (node.tagName !== "!") a.push(node);
     return a;
   },

   // IE improperly serializes _countedByPrototype in (inner|outer)HTML.
   unmark: function(nodes) {
     for (var i = 0, node; node = nodes[i]; i++)
       node.removeAttribute('_countedByPrototype');
     return nodes;
   }
 });
}

function $$() {
 return Selector.findChildElements(document, $A(arguments));
}
var Form = {
 reset: function(form) {
   $(form).reset();
   return form;
 },

 serializeElements: function(elements, options) {
   if (typeof options != 'object') options = { hash: !!options };
   else if (Object.isUndefined(options.hash)) options.hash = true;
   var key, value, submitted = false, submit = options.submit;

   var data = elements.inject({ }, function(result, element) {
     if (!element.disabled && element.name) {
       key = element.name; value = $(element).getValue();
       if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
           submit !== false && (!submit || key == submit) && (submitted = true)))) {
         if (key in result) {
           // a key is already present; construct an array of values
           if (!Object.isArray(result[key])) result[key] = [result[key]];
           result[key].push(value);
         }
         else result[key] = value;
       }
     }
     return result;
   });

   return options.hash ? data : Object.toQueryString(data);
 }
};

Form.Methods = {
 serialize: function(form, options) {
   return Form.serializeElements(Form.getElements(form), options);
 },

 getElements: function(form) {
   return $A($(form).getElementsByTagName('*')).inject([],
     function(elements, child) {
       if (Form.Element.Serializers[child.tagName.toLowerCase()])
         elements.push(Element.extend(child));
       return elements;
     }
   );
 },

 getInputs: function(form, typeName, name) {
   form = $(form);
   var inputs = form.getElementsByTagName('input');

   if (!typeName && !name) return $A(inputs).map(Element.extend);

   for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
     var input = inputs[i];
     if ((typeName && input.type != typeName) || (name && input.name != name))
       continue;
     matchingInputs.push(Element.extend(input));
   }

   return matchingInputs;
 },

 disable: function(form) {
   form = $(form);
   Form.getElements(form).invoke('disable');
   return form;
 },

 enable: function(form) {
   form = $(form);
   Form.getElements(form).invoke('enable');
   return form;
 },

 findFirstElement: function(form) {
   var elements = $(form).getElements().findAll(function(element) {
     return 'hidden' != element.type && !element.disabled;
   });
   var firstByIndex = elements.findAll(function(element) {
     return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
   }).sortBy(function(element) { return element.tabIndex }).first();

   return firstByIndex ? firstByIndex : elements.find(function(element) {
     return ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
   });
 },

 focusFirstElement: function(form) {
   form = $(form);
   form.findFirstElement().activate();
   return form;
 },

 request: function(form, options) {
   form = $(form), options = Object.clone(options || { });

   var params = options.parameters, action = form.readAttribute('action') || '';
   if (action.blank()) action = window.location.href;
   options.parameters = form.serialize(true);

   if (params) {
     if (Object.isString(params)) params = params.toQueryParams();
     Object.extend(options.parameters, params);
   }

   if (form.hasAttribute('method') && !options.method)
     options.method = form.method;

   return new Ajax.Request(action, options);
 }
};

/*--------------------------------------------------------------------------*/

Form.Element = {
 focus: function(element) {
   $(element).focus();
   return element;
 },

 select: function(element) {
   $(element).select();
   return element;
 }
};

Form.Element.Methods = {
 serialize: function(element) {
   element = $(element);
   if (!element.disabled && element.name) {
     var value = element.getValue();
     if (value != undefined) {
       var pair = { };
       pair[element.name] = value;
       return Object.toQueryString(pair);
     }
   }
   return '';
 },

 getValue: function(element) {
   element = $(element);
   var method = element.tagName.toLowerCase();
   return Form.Element.Serializers[method](element);
 },

 setValue: function(element, value) {
   element = $(element);
   var method = element.tagName.toLowerCase();
   Form.Element.Serializers[method](element, value);
   return element;
 },

 clear: function(element) {
   $(element).value = '';
   return element;
 },

 present: function(element) {
   return $(element).value != '';
 },

 activate: function(element) {
   element = $(element);
   try {
     element.focus();
     if (element.select && (element.tagName.toLowerCase() != 'input' ||
         !['button', 'reset', 'submit'].include(element.type)))
       element.select();
   } catch (e) { }
   return element;
 },

 disable: function(element) {
   element = $(element);
   element.disabled = true;
   return element;
 },

 enable: function(element) {
   element = $(element);
   element.disabled = false;
   return element;
 }
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;
var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = {
 input: function(element, value) {
   switch (element.type.toLowerCase()) {
     case 'checkbox':
     case 'radio':
       return Form.Element.Serializers.inputSelector(element, value);
     default:
       return Form.Element.Serializers.textarea(element, value);
   }
 },

 inputSelector: function(element, value) {
   if (Object.isUndefined(value)) return element.checked ? element.value : null;
   else element.checked = !!value;
 },

 textarea: function(element, value) {
   if (Object.isUndefined(value)) return element.value;
   else element.value = value;
 },

 select: function(element, value) {
   if (Object.isUndefined(value))
     return this[element.type == 'select-one' ?
       'selectOne' : 'selectMany'](element);
   else {
     var opt, currentValue, single = !Object.isArray(value);
     for (var i = 0, length = element.length; i < length; i++) {
       opt = element.options[i];
       currentValue = this.optionValue(opt);
       if (single) {
         if (currentValue == value) {
           opt.selected = true;
           return;
         }
       }
       else opt.selected = value.include(currentValue);
     }
   }
 },

 selectOne: function(element) {
   var index = element.selectedIndex;
   return index >= 0 ? this.optionValue(element.options[index]) : null;
 },

 selectMany: function(element) {
   var values, length = element.length;
   if (!length) return null;

   for (var i = 0, values = []; i < length; i++) {
     var opt = element.options[i];
     if (opt.selected) values.push(this.optionValue(opt));
   }
   return values;
 },

 optionValue: function(opt) {
   // extend element because hasAttribute may not be native
   return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
 }
};

/*--------------------------------------------------------------------------*/

Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
 initialize: function($super, element, frequency, callback) {
   $super(callback, frequency);
   this.element   = $(element);
   this.lastValue = this.getValue();
 },

 execute: function() {
   var value = this.getValue();
   if (Object.isString(this.lastValue) && Object.isString(value) ?
       this.lastValue != value : String(this.lastValue) != String(value)) {
     this.callback(this.element, value);
     this.lastValue = value;
   }
 }
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
 getValue: function() {
   return Form.Element.getValue(this.element);
 }
});

Form.Observer = Class.create(Abstract.TimedObserver, {
 getValue: function() {
   return Form.serialize(this.element);
 }
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
 initialize: function(element, callback) {
   this.element  = $(element);
   this.callback = callback;

   this.lastValue = this.getValue();
   if (this.element.tagName.toLowerCase() == 'form')
     this.registerFormCallbacks();
   else
     this.registerCallback(this.element);
 },

 onElementEvent: function() {
   var value = this.getValue();
   if (this.lastValue != value) {
     this.callback(this.element, value);
     this.lastValue = value;
   }
 },

 registerFormCallbacks: function() {
   Form.getElements(this.element).each(this.registerCallback, this);
 },

 registerCallback: function(element) {
   if (element.type) {
     switch (element.type.toLowerCase()) {
       case 'checkbox':
       case 'radio':
         Event.observe(element, 'click', this.onElementEvent.bind(this));
         break;
       default:
         Event.observe(element, 'change', this.onElementEvent.bind(this));
         break;
     }
   }
 }
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
 getValue: function() {
   return Form.Element.getValue(this.element);
 }
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
 getValue: function() {
   return Form.serialize(this.element);
 }
});
if (!window.Event) var Event = { };

Object.extend(Event, {
 KEY_BACKSPACE: 8,
 KEY_TAB:       9,
 KEY_RETURN:   13,
 KEY_ESC:      27,
 KEY_LEFT:     37,
 KEY_UP:       38,
 KEY_RIGHT:    39,
 KEY_DOWN:     40,
 KEY_DELETE:   46,
 KEY_HOME:     36,
 KEY_END:      35,
 KEY_PAGEUP:   33,
 KEY_PAGEDOWN: 34,
 KEY_INSERT:   45,

 cache: { },

 relatedTarget: function(event) {
   var element;
   switch(event.type) {
     case 'mouseover': element = event.fromElement; break;
     case 'mouseout':  element = event.toElement;   break;
     default: return null;
   }
   return Element.extend(element);
 }
});

Event.Methods = (function() {
 var isButton;

 if (Prototype.Browser.IE) {
   var buttonMap = { 0: 1, 1: 4, 2: 2 };
   isButton = function(event, code) {
     return event.button == buttonMap[code];
   };

 } else if (Prototype.Browser.WebKit) {
   isButton = function(event, code) {
     switch (code) {
       case 0: return event.which == 1 && !event.metaKey;
       case 1: return event.which == 1 && event.metaKey;
       default: return false;
     }
   };

 } else {
   isButton = function(event, code) {
     return event.which ? (event.which === code + 1) : (event.button === code);
   };
 }

 return {
   isLeftClick:   function(event) { return isButton(event, 0) },
   isMiddleClick: function(event) { return isButton(event, 1) },
   isRightClick:  function(event) { return isButton(event, 2) },

   element: function(event) {
     event = Event.extend(event);

     var node          = event.target,
         type          = event.type,
         currentTarget = event.currentTarget;

     if (currentTarget && currentTarget.tagName) {
       // Firefox screws up the "click" event when moving between radio buttons
       // via arrow keys. It also screws up the "load" and "error" events on images,
       // reporting the document as the target instead of the original image.
       if (type === 'load' || type === 'error' ||
         (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
           && currentTarget.type === 'radio'))
             node = currentTarget;
     }
     if (node.nodeType == Node.TEXT_NODE) node = node.parentNode;
     return Element.extend(node);
   },

   findElement: function(event, expression) {
     var element = Event.element(event);
     if (!expression) return element;
     var elements = [element].concat(element.ancestors());
     return Selector.findElement(elements, expression, 0);
   },

   pointer: function(event) {
     var docElement = document.documentElement,
     body = document.body || { scrollLeft: 0, scrollTop: 0 };
     return {
       x: event.pageX || (event.clientX +
         (docElement.scrollLeft || body.scrollLeft) -
         (docElement.clientLeft || 0)),
       y: event.pageY || (event.clientY +
         (docElement.scrollTop || body.scrollTop) -
         (docElement.clientTop || 0))
     };
   },

   pointerX: function(event) { return Event.pointer(event).x },
   pointerY: function(event) { return Event.pointer(event).y },

   stop: function(event) {
     Event.extend(event);
     event.preventDefault();
     event.stopPropagation();
     event.stopped = true;
   }
 };
})();

Event.extend = (function() {
 var methods = Object.keys(Event.Methods).inject({ }, function(m, name) {
   m[name] = Event.Methods[name].methodize();
   return m;
 });

 if (Prototype.Browser.IE) {
   Object.extend(methods, {
     stopPropagation: function() { this.cancelBubble = true },
     preventDefault:  function() { this.returnValue = false },
     inspect: function() { return "[object Event]" }
   });

   return function(event) {
     if (!event) return false;
     if (event._extendedByPrototype) return event;

     event._extendedByPrototype = Prototype.emptyFunction;
     var pointer = Event.pointer(event);
     Object.extend(event, {
       target: event.srcElement,
       relatedTarget: Event.relatedTarget(event),
       pageX:  pointer.x,
       pageY:  pointer.y
     });
     return Object.extend(event, methods);
   };

 } else {
   Event.prototype = Event.prototype || document.createEvent("HTMLEvents")['__proto__'];
   Object.extend(Event.prototype, methods);
   return Prototype.K;
 }
})();

Object.extend(Event, (function() {
 var cache = Event.cache;

 function getEventID(element) {
   if (element._prototypeEventID) return element._prototypeEventID[0];
   arguments.callee.id = arguments.callee.id || 1;
   return element._prototypeEventID = [++arguments.callee.id];
 }

 function getDOMEventName(eventName) {
   if (eventName && eventName.include(':')) return "dataavailable";
   return eventName;
 }

 function getCacheForID(id) {
   return cache[id] = cache[id] || { };
 }

 function getWrappersForEventName(id, eventName) {
   var c = getCacheForID(id);
   return c[eventName] = c[eventName] || [];
 }

 function createWrapper(element, eventName, handler) {
   var id = getEventID(element);
   var c = getWrappersForEventName(id, eventName);
   if (c.pluck("handler").include(handler)) return false;

   var wrapper = function(event) {
     if (!Event || !Event.extend ||
       (event.eventName && event.eventName != eventName))
         return false;

     Event.extend(event);
     handler.call(element, event);
   };

   wrapper.handler = handler;
   c.push(wrapper);
   return wrapper;
 }

 function findWrapper(id, eventName, handler) {
   var c = getWrappersForEventName(id, eventName);
   return c.find(function(wrapper) { return wrapper.handler == handler });
 }

 function destroyWrapper(id, eventName, handler) {
   var c = getCacheForID(id);
   if (!c[eventName]) return false;
   c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
 }

 function destroyCache() {
   for (var id in cache)
     for (var eventName in cache[id])
       cache[id][eventName] = null;
 }


 // Internet Explorer needs to remove event handlers on page unload
 // in order to avoid memory leaks.
 if (window.attachEvent) {
   window.attachEvent("onunload", destroyCache);
 }

 // Safari has a dummy event handler on page unload so that it won't
 // use its bfcache. Safari <= 3.1 has an issue with restoring the "document"
 // object when page is returned to via the back button using its bfcache.
 if (Prototype.Browser.WebKit) {
   window.addEventListener('unload', Prototype.emptyFunction, false);
 }

 return {
   observe: function(element, eventName, handler) {
     element = $(element);
     var name = getDOMEventName(eventName);

     var wrapper = createWrapper(element, eventName, handler);
     if (!wrapper) return element;

     if (element.addEventListener) {
       element.addEventListener(name, wrapper, false);
     } else {
       element.attachEvent("on" + name, wrapper);
     }

     return element;
   },

   stopObserving: function(element, eventName, handler) {
     element = $(element);
     var id = getEventID(element), name = getDOMEventName(eventName);

     if (!handler && eventName) {
       getWrappersForEventName(id, eventName).each(function(wrapper) {
         element.stopObserving(eventName, wrapper.handler);
       });
       return element;

     } else if (!eventName) {
       Object.keys(getCacheForID(id)).each(function(eventName) {
         element.stopObserving(eventName);
       });
       return element;
     }

     var wrapper = findWrapper(id, eventName, handler);
     if (!wrapper) return element;

     if (element.removeEventListener) {
       element.removeEventListener(name, wrapper, false);
     } else {
       element.detachEvent("on" + name, wrapper);
     }

     destroyWrapper(id, eventName, handler);

     return element;
   },

   fire: function(element, eventName, memo) {
     element = $(element);
     if (element == document && document.createEvent && !element.dispatchEvent)
       element = document.documentElement;

     var event;
     if (document.createEvent) {
       event = document.createEvent("HTMLEvents");
       event.initEvent("dataavailable", true, true);
     } else {
       event = document.createEventObject();
       event.eventType = "ondataavailable";
     }

     event.eventName = eventName;
     event.memo = memo || { };

     if (document.createEvent) {
       element.dispatchEvent(event);
     } else {
       element.fireEvent(event.eventType, event);
     }

     return Event.extend(event);
   }
 };
})());

Object.extend(Event, Event.Methods);

Element.addMethods({
 fire:          Event.fire,
 observe:       Event.observe,
 stopObserving: Event.stopObserving
});

Object.extend(document, {
 fire:          Element.Methods.fire.methodize(),
 observe:       Element.Methods.observe.methodize(),
 stopObserving: Element.Methods.stopObserving.methodize(),
 loaded:        false
});

(function() {
 /* Support for the DOMContentLoaded event is based on work by Dan Webb,
    Matthias Miller, Dean Edwards and John Resig. */

 var timer;

 function fireContentLoadedEvent() {
   if (document.loaded) return;
   if (timer) window.clearInterval(timer);
   document.fire("dom:loaded");
   document.loaded = true;
 }

 if (document.addEventListener) {
   if (Prototype.Browser.WebKit) {
     timer = window.setInterval(function() {
       if (/loaded|complete/.test(document.readyState))
         fireContentLoadedEvent();
     }, 0);

     Event.observe(window, "load", fireContentLoadedEvent);

   } else {
     document.addEventListener("DOMContentLoaded",
       fireContentLoadedEvent, false);
   }

 } else {
   document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
   $("__onDOMContentLoaded").onreadystatechange = function() {
     if (this.readyState == "complete") {
       this.onreadystatechange = null;
       fireContentLoadedEvent();
     }
   };
 }
})();
/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
 Before: function(element, content) {
   return Element.insert(element, {before:content});
 },

 Top: function(element, content) {
   return Element.insert(element, {top:content});
 },

 Bottom: function(element, content) {
   return Element.insert(element, {bottom:content});
 },

 After: function(element, content) {
   return Element.insert(element, {after:content});
 }
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

//This should be moved to script.aculo.us; notice the deprecated methods
//further below, that map to the newer Element methods.
var Position = {
 // set to true if needed, warning: firefox performance problems
 // NOT neeeded for page scrolling, only if draggable contained in
 // scrollable elements
 includeScrollOffsets: false,

 // must be called before calling withinIncludingScrolloffset, every time the
 // page is scrolled
 prepare: function() {
   this.deltaX =  window.pageXOffset
               || document.documentElement.scrollLeft
               || document.body.scrollLeft
               || 0;
   this.deltaY =  window.pageYOffset
               || document.documentElement.scrollTop
               || document.body.scrollTop
               || 0;
 },

 // caches x/y coordinate pair to use with overlap
 within: function(element, x, y) {
   if (this.includeScrollOffsets)
     return this.withinIncludingScrolloffsets(element, x, y);
   this.xcomp = x;
   this.ycomp = y;
   this.offset = Element.cumulativeOffset(element);

   return (y >= this.offset[1] &&
           y <  this.offset[1] + element.offsetHeight &&
           x >= this.offset[0] &&
           x <  this.offset[0] + element.offsetWidth);
 },

 withinIncludingScrolloffsets: function(element, x, y) {
   var offsetcache = Element.cumulativeScrollOffset(element);

   this.xcomp = x + offsetcache[0] - this.deltaX;
   this.ycomp = y + offsetcache[1] - this.deltaY;
   this.offset = Element.cumulativeOffset(element);

   return (this.ycomp >= this.offset[1] &&
           this.ycomp <  this.offset[1] + element.offsetHeight &&
           this.xcomp >= this.offset[0] &&
           this.xcomp <  this.offset[0] + element.offsetWidth);
 },

 // within must be called directly before
 overlap: function(mode, element) {
   if (!mode) return 0;
   if (mode == 'vertical')
     return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
       element.offsetHeight;
   if (mode == 'horizontal')
     return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
       element.offsetWidth;
 },

 // Deprecation layer -- use newer Element methods now (1.5.2).

 cumulativeOffset: Element.Methods.cumulativeOffset,

 positionedOffset: Element.Methods.positionedOffset,

 absolutize: function(element) {
   Position.prepare();
   return Element.absolutize(element);
 },

 relativize: function(element) {
   Position.prepare();
   return Element.relativize(element);
 },

 realOffset: Element.Methods.cumulativeScrollOffset,

 offsetParent: Element.Methods.getOffsetParent,

 page: Element.Methods.viewportOffset,

 clone: function(source, target, options) {
   options = options || { };
   return Element.clonePosition(target, source, options);
 }
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function(instanceMethods){
 function iter(name) {
   return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
 }

 instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
 function(element, className) {
   className = className.toString().strip();
   var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
   return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
 } : function(element, className) {
   className = className.toString().strip();
   var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
   if (!classNames && !className) return elements;

   var nodes = $(element).getElementsByTagName('*');
   className = ' ' + className + ' ';

   for (var i = 0, child, cn; child = nodes[i]; i++) {
     if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
         (classNames && classNames.all(function(name) {
           return !name.toString().blank() && cn.include(' ' + name + ' ');
         }))))
       elements.push(Element.extend(child));
   }
   return elements;
 };

 return function(className, parentElement) {
   return $(parentElement || document.body).getElementsByClassName(className);
 };
}(Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
 initialize: function(element) {
   this.element = $(element);
 },

 _each: function(iterator) {
   this.element.className.split(/\s+/).select(function(name) {
     return name.length > 0;
   })._each(iterator);
 },

 set: function(className) {
   this.element.className = className;
 },

 add: function(classNameToAdd) {
   if (this.include(classNameToAdd)) return;
   this.set($A(this).concat(classNameToAdd).join(' '));
 },

 remove: function(classNameToRemove) {
   if (!this.include(classNameToRemove)) return;
   this.set($A(this).without(classNameToRemove).join(' '));
 },

 toString: function() {
   return $A(this).join(' ');
 }
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

Element.addMethods();