var AJAX = {
		getRequestObject : function(){
			var _oXmlHttpRequest;
			if (window.XMLHttpRequest) { // Mozilla, Safari,...
				try 
				{
					_oXmlHttpRequest = new XMLHttpRequest();
					
				}
				catch (e) 
				{
					HTML.writeToElement("Permission UniversalBrowserRead denied.","debug");
				}
			} 
			else if (window.ActiveXObject) 
			{ // IE
				try 
				{
					_oXmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
				}
				catch (e) 
				{
					try 
					{
						_oXmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
					} 
					catch (e) {
						HTML.writeToElement("Error create ActiveXObject.","debug");
					}
				}
			}

			if (!_oXmlHttpRequest) 
			{
				HTML.writeToElement("Giving up :( Cannot create an XMLHTTP instance","debug");
				return false;
			}

			return _oXmlHttpRequest;
		
		}
	}

	AJAX.Request = function(){
		this.init(arguments[0], arguments[1]);
	}

	AJAX.Request.prototype = {
		init: function(strURL, oOptions){
			this.strURL = strURL;
			this.oOptions = Object.extend({
												method: "post",
												asynchronous: true,
												parameters: "",
												responseEl: "",
												preloader: true,
												preloaderText: "loading ...",
												responseType: "html",
												customHandler: false
												}, oOptions
											);
		
			this.oRequest = AJAX.getRequestObject();
			//HTML.writeToElement("getting >> " + strURL + "<br />param " + this.oOptions.parameters , "debug");
			this.request(strURL);
		},
		
		customHandler: function(){
			HTML.writeToElement("add following code for custom handler:<br /><i>"+
				"AJAX.Request.prototype.customHandler = function([arguments]){<br />"+
				"[put your code here ....]<br />"+
				"}</i>"	
				, this.oOptions.responseEl);
		},
		
		request: function(strURL){
			/*prototype library code*/
			//get parameters
			var parameters = this.oOptions.parameters || '';
			if (parameters.length > 0) parameters += '&_=';

			this.strURL = strURL;
      if (this.oOptions.method == 'get' && parameters.length > 0){
        this.strURL += (this.strURL.match(/\?/) ? '&' : '?') + parameters;
			}
			/*prototype library code*/
			
			if (window.XMLHttpRequest) {/*fix ff; to make HTTPRequest from local system*/
				var strLocation = new String(window.location);
				if(strLocation.indexOf("http://") == -1){
					netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
				}
			}
			
			//startup request	
			this.oRequest.open(this.oOptions.method, this.strURL, this.oOptions.asynchronous, this.oOptions.username != "" ? this.oOptions.username : "", this.oOptions.password != "" ? this.oOptions.password : "");
			//set headers
			this.setRequestHeaders();
			//set handler
			this.oRequest.onreadystatechange = this.onStateChange.bind(this);
			//add post/get data
			var body = this.oOptions.postBody ? this.oOptions.postBody : parameters;
			//HTML.writeTextToElement(body, "debug");
			//start request
      this.oRequest.send(this.oOptions.method == 'post' ? body : null);

		},

		onStateChange: function(){
			if(this.oRequest.readyState == 4){
				
				if(this.oOptions.customHandler == true){
					if (this.oOptions.responseType == "text" || this.oOptions.responseType == "html") {
						this.customHandler(this.oRequest.responseText);
					}
					else if(this.oOptions.responseType == "xml"){
						this.customHandler(this.oRequest.responseXML);
					}
				}
				else if(this.oOptions.customHandler == false){
					this.responseHandler();
				}
			}
			else if ((this.oRequest.readyState != 4) && (this.oOptions.preloader==true)){
				this.loadingHandler();
			}
		},

		responseHandler: function(){
			if(this.oOptions.responseType == "html"){
				HTML.writeToElement(this.oRequest.responseText, this.oOptions.responseEl);
			}
			else if (this.oOptions.responseType == "text"){
				HTML.writeTextToElement(this.oRequest.responseText, this.oOptions.responseEl);
			}
			else if(this.oOptions.responseType == "xml"){
				HTML.writeToElement(this.oRequest.responseXML);
			}			
		},

		loadingHandler: function(){
			HTML.writeToElement(this.oOptions.preloaderText, this.oOptions.responseEl);
		},

		/*prototype library functions*/
		setRequestHeaders: function() {
			var requestHeaders = ['X-Requested-With', 'XMLHttpRequest'];

			if (this.oOptions.method == 'post') {
				requestHeaders.push('Content-type', 'application/x-www-form-urlencoded');

				/* Force "Connection: close" for Mozilla browsers to work around
				 * a bug where XMLHttpReqeuest sends an incorrect Content-length
				 * header. See Mozilla Bugzilla #246651. 
				 */
				if (this.oRequest.overrideMimeType){
					requestHeaders.push('Connection', 'close');
				}
			}

			if (this.oOptions.requestHeaders){
				requestHeaders.push.apply(requestHeaders, this.oOptions.requestHeaders);
			}

			for (var i = 0; i < requestHeaders.length; i += 2){
				this.oRequest.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
			}
		}
	}
	/*prototype library functions*/
	
	/*prototype library functions*/
	Function.prototype.bind = function() {
		var __method = this, args = arguments, object = args[0];
		return function() {
			return __method.apply(object, arguments); 
		}
	}

	Object.extend = function(destination, source) {
		for (property in source) {
			destination[property] = source[property];
		}
		return destination;
	}
	/*prototype library functions*/