/*  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]) {
        var key=decodeURIComponent(pair.shift());
        var value=pair.length>1 ? pair.join('=') : pair[0];
        if(value !=undefined) value=decodeURIComponent(value);

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

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

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

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

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

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

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

    return camelized;
  },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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