var Class = {
  create: function() {
    return function() { 
      this.initialize.apply(this, arguments);
    }
  }
}

var Abstract = new Object();

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

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

Function.prototype.bind = function() {
  var __method = this, args = $A(arguments), object = args.shift();
  return function() {
    return __method.apply(object, args.concat($A(arguments)));
  }
}

Function.prototype.bindAsEventListener = function(object) {
  var __method = this;
  return function(event) {
    return __method.call(object, event || window.event);
  }
}

Object.extend(Number.prototype, {
  toColorPart: function() {
    var digits = this.toString(16);
    if (this < 16) return '0' + digits;
    return digits;
  },

  succ: function() {
    return this + 1;
  },
  
  times: function(iterator) {
    $R(0, this, true).each(iterator);
    return this;
  }
});


function $() {
  var elements = new Array();

  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);

    if (arguments.length == 1) 
      return element;

    elements.push(element);
  }

  return elements;
}

//extract from Position.js
var Position={
    cumulativeOffset: function(element) {
        var valueT = 0, valueL = 0;
        do {
          valueT += element.offsetTop  || 0;
          valueL += element.offsetLeft || 0;
          element = element.offsetParent;
        } while (element);
        return [valueL, valueT];
    },
    center:function(width,height,doc){
        this.doc=doc?doc.document:document;
        var theBody=this.doc.getElementsByTagName('BODY')[0]; 
        var scTop = this.scrollTop();
        var scLeft = this.scrollLeft();
        var fullHeight = this.fullHeight();
        var fullWidth = this.fullWidth();
        var _top=scTop + ((fullHeight - (height+20)) / 2);
        return [
            scLeft + ((fullWidth - width) / 2),
            _top<0?scTop:_top
        ];
    },
    scrollTop:function(){
        if(document.documentElement && document.documentElement.scrollTop) return this.doc.documentElement.scrollTop;
        else return this.doc.body.scrollTop;
    },
    scrollLeft:function(){
        if(document.documentElement && document.documentElement.scrollLeft) return this.doc.documentElement.scrollLeft;
        else return this.doc.body.scrollLeft;
    },
    fullHeight:function(){
        if (window.innerHeight!=window.undefined) return window.innerHeight;
        if (document.documentElement && document.documentElement.clientHeight) return this.doc.documentElement.clientHeight;
        if (document.body) return this.doc.body.clientHeight; 
        return window.undefined; 
    },
    fullWidth:function() {
        if (window.innerWidth!=window.undefined) return window.innerWidth; 
        if (document.documentElement && document.documentElement.clientWidth) return this.doc.documentElement.clientWidth; 
        if (document.body) return this.doc.body.clientWidth; 
        return window.undefined; 
    },
    doc:document
}

// Safari returns margins on body which is incorrect if the child is absolutely
// positioned.  For performance reasons, redefine Position.cumulativeOffset for
// KHTML/WebKit only.
if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {
  Position.cumulativeOffset = function(element) {
    var valueT = 0, valueL = 0;
    do {
      valueT += element.offsetTop  || 0;
      valueL += element.offsetLeft || 0;
      if (element.offsetParent == document.body){
        try{if (Element.getStyle(element, 'position') == 'absolute') break;}
        catch(exception){}
        }
        
      element = element.offsetParent;
    } while (element);
    
    return [valueL, valueT];
  }
}

///////////////////////////////////////////////////////////////////////////////////////////

if (!window.Event) {
  var Event = new Object();
}

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,

  element: function(event) {
    return event.target || event.srcElement;
  },

  isLeftClick: function(event) {
    return (((event.which) && (event.which == 1)) ||
            ((event.button) && (event.button == 1)));
  },

  pointerX: function(event) {
    return event.pageX || (event.clientX + 
      (document.documentElement.scrollLeft || document.body.scrollLeft));
  },

  pointerY: function(event) {
    return event.pageY || (event.clientY + 
      (document.documentElement.scrollTop || document.body.scrollTop));
  },

  stop: function(event) {
    if (event.preventDefault) { 
      event.preventDefault(); 
      event.stopPropagation(); 
    } else {
      event.returnValue = false;
      event.cancelBubble = true;
    }
  },

  // find the first node with the given tagName, starting from the
  // node the event was triggered on; traverses the DOM upwards
  findElement: function(event, tagName) {
    var element = Event.element(event);
    while (element.parentNode && (!element.tagName ||
        (element.tagName.toUpperCase() != tagName.toUpperCase())))
      element = element.parentNode;
    return element;
  },

  observers: false,
  
  _observeAndCache: function(element, name, observer, useCapture) {
    if (!this.observers) this.observers = [];
    if (element.addEventListener) {
      this.observers.push([element, name, observer, useCapture]);
      element.addEventListener(name, observer, useCapture);
    } else if (element.attachEvent) {
      this.observers.push([element, name, observer, useCapture]);
      element.attachEvent('on' + name, observer);
    }
  },
  
  unloadCache: function() {
    if (!Event.observers) return;
    for (var i = 0; i < Event.observers.length; i++) {
      Event.stopObserving.apply(this, Event.observers[i]);
      Event.observers[i][0] = null;
    }
    Event.observers = false;
  },

  observe: function(element, name, observer, useCapture) {
    var element = $(element);
    useCapture = useCapture || false;
    
    if (name == 'keypress' &&
        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
        || element.attachEvent))
      name = 'keydown';
    
    this._observeAndCache(element, name, observer, useCapture);
  },
  stopAlreadyObserve:function(element){
    if(!Event.observers) return;
    for(var i=0;i<Event.observers.length;i++){
        if(Event.observers[i][0]==$(element)){
            Event.stopObserving.apply(this,Event.observers[i]);
            Event.observers[i][0]=null;
        }
    }
  },

  stopObserving: function(element, name, observer, useCapture) {
    var element = $(element);
    if(element==null) return;
    useCapture = useCapture || false;
    if (name == 'keypress' &&
        (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
        || element.detachEvent))
      name = 'keydown';
    
    if (element.removeEventListener) {
      element.removeEventListener(name, observer, useCapture);
    } else if (element.detachEvent) {
      element.detachEvent('on' + name, observer);
    }
  },
      isMouseLeaveOrEnter:function(event,target){
        var relatedTarget=event.relatedTarget?event.relatedTarget:event.type=='mouseout'?event.toElement:event.fromElement;
        if(typeof relatedTarget=='undefined') return false;
        while(relatedTarget && relatedTarget!=target) relatedTarget=relatedTarget.parentNode;
        return relatedTarget!=target;
    }

});

/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);
/////////////////////////////////////////////////////////////////////////////////////
var Try={
    these:function(){
        var returnValue;
        for(var i=0;i<arguments.length;i++){
            var lambda=arguments[i];
            try{
                returnValue=lambda();
                break;
            }catch(e){}
        }
        return returnValue;
    }
}
var Ajax=Object.extend({},{
    AsyncPost:function(url,data,clientCallback){
        var xmlhttp=this.xmlhttp();
        if(xmlhttp){
            xmlhttp.open('POST',url,true);
            xmlhttp.setRequestHeader("Accept-charset","utf-8");                
            xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
            
            xmlhttp.onreadystatechange=function(){
                if(xmlhttp.readyState==4) clientCallback(xmlhttp.responseText);
            }
            xmlhttp.send(data);
        }
    },
    xmlhttp:function(){
        return Try.these(
        function(){return new ActiveXObject('Msxml2.XMLHTTP')},
        function(){return new ActiveXObject('Microsoft.XMLHTTP')},
        function(){return new XMLHttpRequest()}
        ) || false
    }
})