function ajax(url)
{
	var xmlhttp=new GetXmlHttpObject();
			
	xmlhttp.open('GET',url,true);
	xmlhttp.send(null);
}

function GetXmlHttpObject()
{
	if (window.XMLHttpRequest)
	{
		// code for IE7+, Firefox, Chrome, Opera, Safari
		return new XMLHttpRequest();
	}
	if (window.ActiveXObject)
	{
		// code for IE6, IE5
		return new ActiveXObject("Microsoft.XMLHTTP");
	}
	else
	{
		alert ("Your browser does not support XMLHTTP");
	}
	return null;
}