// ALL PURPOSE FUNCTIONS

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

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

// ELEMENT CLASS
if(!window.Element) var Element = new Object();
Object.extend(Element, {
	remove : function(element) {
		element = $(element);
		element.parentNode.removeChild(element);
	}, 
	
  hide: function() {
    for (var i = 0; i < arguments.length; i++) {
      var element = $(arguments[i]);
      element.style.display = 'none';
    }
  },

  show: function() {
    for (var i = 0; i < arguments.length; i++) {
      var element = $(arguments[i]);
      element.style.display = '';
    }
  }
});

// EVENT CLASS
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);
  },

  stopObserving: function(element, name, observer, useCapture) {
    var element = $(element);
    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);
    }
  }
});

/* prevent memory leaks in IE */
Event.observe(window, 'unload', Event.unloadCache, false);

// XHR CLASS

var XHR = {		
	
	setOptions: function(options) {
		if(!options.method) options.method = 'post';				
		return options;
	},
	
	request: function (url, options) {
		var opts = XHR.setOptions(options);			
		var xml;
		
		if(!url) return false;
		if(!opts.method)	{ 
			opts.method = 'post';
		} else {			
			url = (opts.parameters) ? url + '?'+opts.parameters : url;
		}
		try { xml = new XMLHttpRequest(); }
		catch(e) {
			var versions = new Array('MSXML2.XMLHTTP.6.0','MSXML2.XMLHTTP.5.0','MSXML2.HTTP.4.0','MSXML.HTTP.3.0','MSXML2.HTTP','Microsoft.XMLHTTP');
			for(var i=0; i<versions.length && !xml; i++) {
				try { xml = new ActiveXObject(versions[i]); }
				catch(e) {} // ignore potential errors
			}
		}
		if(xml) { // make the request				
			xml.onreadystatechange = function() { XHR.handler(xml.readyState, xml, opts); }
			xml.open(opts.method, url, true);
			if(opts.method == 'post'){				
				xml.send(opts.parameters);
			} else {				
				xml.send(null);
			}
		}
	}, 
	
	handler: function(state, xml, opts) {		
		if(opts.loading) {
			if(state <4) XHR.onLoading(opts.loading);
		}			
		if(state == 4) {
			if(opts.success) {			
				response = xml.responseText								
				eval(opts.success+'(response, opts.caller)');
			}
		}
	},
	
	onLoading: function(callback) {				
		callback = callback+'()';
		eval(callback);		
	},
	
	onSuccess: function(xml) { 
		return xml.responseText;
	}	
};


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;
}
/*
function getElementsByClassName(strClass, strTag, objContElm) {
  strTag = strTag || "*";
  objContElm = objContElm || document;
  var objColl = objContElm.getElementsByTagName(strTag);
  if (!objColl.length &&  strTag == "*" &&  objContElm.all) objColl = objContElm.all;
  var arr = new Array();
  var delim = strClass.indexOf('|') != -1  ? '|' : ' ';
  var arrClass = strClass.split(delim);
  for (var i = 0, j = objColl.length; i < j; i++) {
    var arrObjClass = objColl[i].className.split(' ');
    if (delim == ' ' && arrClass.length > arrObjClass.length) continue;
    var c = 0;
    comparisonLoop:
    for (var k = 0, l = arrObjClass.length; k < l; k++) {
      for (var m = 0, n = arrClass.length; m < n; m++) {
        if (arrClass[m] == arrObjClass[k]) c++;
        if (( delim == '|' && c == 1) || (delim == ' ' && c == arrClass.length)) {
          arr.push(objColl[i]);
          break comparisonLoop;
        }
      }
    }
  }
  return arr;
}


    Written by Jonathan Snook, http://www.snook.ca/jonathan
    Add-ons by Robert Nyman, http://www.robertnyman.com

*/

function getElementsByClassName(oElm, strTagName, strClassName){	
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);	
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");	
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }   
    }	
    return (arrReturnElements)
}

// ============ ADD EVENTS ================ //
function addEvent(obj, evType, fn){
    if (obj.addEventListener) {
        obj.addEventListener(evType, fn, true);
        return true;
    } else if (obj.attachEvent) {
        var r = obj.attachEvent("on"+evType, fn);
        return r;
    } else {
	    return false;
    }
}