var req = null;

//Ajax request doen
function ajax_Request (url, callback)
{
	try
	{
		req = null;
		if (window.XMLHttpRequest)
		{
			req = new XMLHttpRequest ();
		} else if (window.ActiveXObject)
		{
			try { req = new ActiveXObject ("Microsoft.XMLHTTP"); }
			catch (e) {
				try { req = new ActiveXObject ("Msxml2.XMLHTTP"); }
				catch (e) {}
			}
		}
		req.onreadystatechange = callback;
		req.open ("GET", url, true);
		req.send (null);
	} catch (e) {}
	return req;
}