function createXMLHttp()
{
	if (typeof XMLHttpRequest != "undefined")
	{
		return new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		var aVersions = ["MSXML2.XMLHttp.5.0", "MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0", 
		"MSXML2.XMLHttp", "Microsoft.XMLHttp"];
		
		for (var i=0; i<aVersions.length; i++)
		{
			try
			{
				var oXmlHttp = new ActiveXObject(aVersions[i]);
				return oXmlHttp;
			}
			catch (oError) {}
		}
	}
	throw new Error("Error occurred.");
}