var req = null;

//Ajax request doen
function ajax_Request (url, callback)
{
	try
	{
	 	req = window.XMLHttpRequest ? new XMLHttpRequest() : (window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : null);
		req.onreadystatechange = callback;
		req.open ("GET", url, true);
		req.send (null);
	} catch (e) {}
	return req;
}