function getXmlHttp()
{
	try
	{
		return new XMLHttpRequest();
	}
	catch (e)
	{
		try
		{
			return new ActiveXObject("Msxml2.XMLHTTP");
		}
	 	catch (e)
		{
			try
		  	{
		  		return new ActiveXObject("Microsoft.XMLHTTP");
		  	}
			catch (e)
		  	{
		  		alert("Your browser does not support AJAX.  Please upgrade to a newer web browser.");
		  	}
		}
	}
}