function GetResponse(url)
{
    //alert('Hi u r in GetResponse ' + url);
    if(navigator.appName == "Microsoft Internet Explorer")
    {
	    var xhttp = new ActiveXObject("Msxml2.XMLHTTP");
	}
	else
	{
        var xhttp = new XMLHttpRequest();
    }
	xhttp.open("GET", url, true);
	xhttp.onreadystatechange = 
	function() 
	{
	     
		if (xhttp.readyState == 4 && xhttp.responseText) 
		{
		    alert("Hi u r in if condition");
			validateResponse(xhttp);
			Response(xhttp.responseXML);
			alert("Hi u r finish if condition");
		}
	}
	xhttp.send(null);
}

function validateResponse(xhttp)
{
    alert(xhttp.status);
	if(xhttp.status != 200)
	{
		throw "Some error occured while receiving data from server. Please try again";
	}
}

function Getreq(xml)
{
  //alert('U r in getreq');
}