/*  Prototype JavaScript framework, version 1.6.0.2
     *  (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: '1.6.0.2',

      Browser: {
        IE:     !!(window.attachEvent && !window.opera),
        Opera:  !!window.opera,
        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,
        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 = Object.extend((function(m) {
              return function() { return ancestor[m].apply(this, arguments) };
            })(property).wrap(method), {
              valueOf:  function() { return method },
              toString: function() { return method.toString() }
            });
          }
          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].split(",").invoke("strip");
        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);
      },

      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)));
        };
      }
    });

    Function.prototype.defer = Function.prototype.delay.curry(0.01);

    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]) {
          
		    //-> INFORMATIONS : 
		    /*
		        http://www.achingbrain.net/alex/prototype-stringtoqueryparams-weirdness
		        http://www.achingbrain.net/files/prototype_toQueryParams_bug/string.js.patch
		        http://prototype.lighthouseapp.com/projects/8886/tickets/15-patch-test-string-toqueryparams-not-handling-properly
    		
		    */
            var key = decodeURIComponent(pair.shift());
	        //-> STRING PATCH
            //var key = unescape(decodeURIComponent(escape(pair.shift())));
            
            var value = pair.length > 1 ? pair.join('=') : pair[0];
            if (value != undefined) value = decodeURIComponent(value);
            //-> STRING PATCH
            //if (value != undefined) value = unescape(decodeURIComponent(escape(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.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('')
    });

    with (String.prototype.escapeHTML) div.appendChild(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;
        iterator = iterator.bind(context);
        try {
          this._each(function(value) {
            iterator(value, index++);
          });
        } catch (e) {
          if (e != $break) throw e;
        }
        return this;
      },

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

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

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

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

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

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

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

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

        this.each(function(value, index) {
          if (filter.match(value))
            results.push(iterator(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) {
        iterator = iterator.bind(context);
        this.each(function(value, index) {
          memo = iterator(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 ? iterator.bind(context) : Prototype.K;
        var result;
        this.each(function(value, index) {
          value = iterator(value, index);
          if (result == null || value >= result)
            result = value;
        });
        return result;
      },

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

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

      sortBy: function(iterator, context) {
        iterator = iterator.bind(context);
        return this.map(function(value, index) {
          return {value: value, criteria: iterator(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 [];
        if (!(Object.isFunction(iterable) && iterable == '[object NodeList]') &&
            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) {
        $R(0, this, true).each(iterator);
        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) {
          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.map(function(pair) {
            var key = encodeURIComponent(pair.key), values = pair.value;

            if (values && typeof values == 'object') {
              if (Object.isArray(values))
                return values.map(toQueryPair.curry(key)).join('&');
            }
            return toQueryPair(key, values);
          }).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 || { });
    }).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).style.display = 'none';
        return element;
      },

      show: function(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(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);
        var originalAncestor = ancestor;

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

        if (element.sourceIndex && !Prototype.Browser.Opera) {
          var e = element.sourceIndex, a = ancestor.sourceIndex,
           nextAncestor = ancestor.nextSibling;
          if (!nextAncestor) {
            do { ancestor = ancestor.parentNode; }
            while (!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
          }
          if (nextAncestor && nextAncestor.sourceIndex)
           return (e > a && e < nextAncestor.sourceIndex);
        }

        while (element = element.parentNode)
          if (element == originalAncestor) 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) {
          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 (window.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 == '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;
        // 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;
        // 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 == '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);
          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);
            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.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').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 == '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, 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 = { };
        var B = Prototype.Browser;
        $w('width height').each(function(d) {
          var D = d.capitalize();
          dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
            (B.Opera) ? document.body['client' + 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();
        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(this.expression))
          return false;

        return true;
      },

      compileMatcher: function() {
        if (this.shouldUseXPath())
          return this.compileXPathMatcher();

        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;
        if (this.xpath) return document._getElementsByXPath(this.xpath, root);
        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 or translate(text(), ' \t\r\n', '') = '')]",
          'checked':     "[@checked]",
          'disabled':    "[@disabled]",
          'enabled':     "[not(@disabled)]",
          '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: /^\[([\w]+)\]/,
        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 && !node.innerHTML.match(/^\s*$/))) 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) 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.startsWith(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 != '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.blur();
        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, index) {
        if (Object.isUndefined(index))
          return this[element.type == 'select-one' ?
            'selectOne' : 'selectMany'](element);
        else {
          var opt, value, single = !Object.isArray(index);
          for (var i = 0, length = element.length; i < length; i++) {
            opt = element.options[i];
            value = this.optionValue(opt);
            if (single) {
              if (value == index) {
                opt.selected = true;
                return;
              }
            }
            else opt.selected = index.include(value);
          }
        }
      },

      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) {
          var node = Event.extend(event).target;
          return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : 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) {
          return {
            x: event.pageX || (event.clientX +
              (document.documentElement.scrollLeft || document.body.scrollLeft)),
            y: event.pageY || (event.clientY +
              (document.documentElement.scrollTop || document.body.scrollTop))
          };
        },

        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;
      }

      if (window.attachEvent) {
        window.attachEvent("onunload", destroyCache);
      }

      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();