function FactoryXMLHttpRequest() 
{
	if(window.XMLHttpRequest) 
	{
		return new XMLHttpRequest();
	}
	else if(window.ActiveXObject) 
	{
		var msxmls = new Array(
			'Msxml2.XMLHTTP.5.0',
			'Msxml2.XMLHTTP.4.0',
			'Msxml2.XMLHTTP.3.0',
			'Msxml2.XMLHTTP',
			'Microsoft.XMLHTTP');
		for (var i = 0; i < msxmls.length; i++) 
		{
			try 
			{
				return new ActiveXObject(msxmls[i]);
			} 
			catch (e) {	}
		}
	}
	throw new Error("Could not instantiate XMLHttpRequest");
}