/*
*	This file creates the instance of xmlHttpRequest object, sends and
* receives the request and response respectively.
*/
/*
* Static script to instantiate XMLHttp object for different browsers.
*/
//0var clientHttpHandler;
//clientHttpHandler = create();

function ServerXMLHTTPRequest()
{
	this.clientHttpHandler = create();
	this.httpMethod = "GET"; 
	this.serverUrl = ""; 
	this.isAsync = true;
	this.respFunc = "";
	this.send = function () {
								if(this.serverUrl != "")
								 {
									this.clientHttpHandler.open(this.httpMethod, this.serverUrl, this.isAsync);
									this.clientHttpHandler.onreadystatechange = this.respFunc;
									this.clientHttpHandler.send(null); 
		 
								 }
				};
	this.receive = receive;
	//this.datareceived = function () { return (this.receive()) };
}


/* This method creates the xmlHttpRequest object and returns it.
*/
function create()	
{
	var xmlHttpRequest = false;

	//Internet Explorer
	try
	{
		xmlHttpRequest = new ActiveXObject("Msxml2.XMLHTTP");
		//alert("creating new Msxml2.XMLHTTP obj");
	}
	catch (xml2Exception)
	{
		try
		{
			xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");
					alert("creating new Microsoft.XMLHTTP obj");
		}
		catch (xmlException)
		{
			xmlHttpRequest = false;
		}
	}

	//Netscape, Mozila, Firefox, Safari, Opera
	if (!xmlHttpRequest && typeof XMLHTTPRequest == 'undefined')
	{
		try
		{
			//alert("creating new ff obj");
			xmlHttpRequest = new XMLHttpRequest();
		}
		catch (genException)
		{
			XMLHttpRequest = false;
		}
	}
	
	if (!xmlHttpRequest && window.createRequest)
	{
		try
		{
			xmlHttpRequest = window.createRequest();
		} 
		catch (e)
		{
			xmlHttpRequest=false;
		}
	}

	/*if(xmlHttpRequest == false)
		alert ("Browser Initialization Error !!\nBrowser does not support all functionalities for the chat.");	
*/
	return xmlHttpRequest;
}
/*
* This method sends the request to the server url according to the
* passing parameters. It sets the users's response function to the 
*	onreadystatechange event of the xmlHttpRequest object.
*/
/*
function send()
{
	this.clientHttpHandler.open(this.httpMethod, this.serverUrl, this.isAsync);
	this.clientHttpHandler.onreadystatechange = this.respFunc;
	this.clientHttpHandler.send(null);
}
*/
/*
function createAndSend(httpMethod, serverUrl, isAsync, respFunc)
{
	var freshClientHttpHandler = create();
	clientHttpHandler = freshClientHttpHandler;
	clientHttpHandler.open(httpMethod, serverUrl, isAsync);
	clientHttpHandler.onreadystatechange = respFunc;
	clientHttpHandler.send(null);
}
*/

/*
* This method checks the state and the status of the response and
* depending on that fetches the response text.
* readystate: 0 - uninitialized, 1 - loading, 2 - loaded, 3 - interactive, 4 - complete
*/
function receive()
{
	try
	{
		if (this.clientHttpHandler.readyState == 4) // Completed
		{
			var status = this.clientHttpHandler.status;
			if (status == 200) // "OK"
			{
				return true;
			}
			else if (status == 403) // "Forbidden"
			{
				//alert("Error: Access denied. Please check the permissions!");
			}
			else if (status == 404) // "URL Not Found"
			{
				//alert("Error: URL not found. Please check the URL!");
			}
			else // Miscellaneous
			{
				//alert("Error: status code " + status);
			}
		}
		return false;
	}
	catch (genException)
	{
	}
}

function destructObj(objToDestroy)
{
	//alert("deleting Obj");
	objToDestroy = null;	
}