function getXMLHttpRequest()
{
	if(window.XMLHttpRequest)
	{
		return new XMLHttpRequest();
	}
	else if(window.ActiveXObject)
	{
		var versions = new Array(
			"Msxml2.XMLHTTP.7.0",
			"Msxml2.XMLHTTP.6.0",
			"Msxml2.XMLHTTP.5.0",
			"Msxml2.XMLHTTP.4.0",
			"Msxml2.XMLHTTP.3.0",
			"Msxml2.XMLHTTP",
			"Microsoft.XMLHTTP"
		);

		for (var i = 0; i < versions.length; i++)
		{
			try
			{
				return new ActiveXObject(versions[i]);
			}
			catch (e) {}
		}
	}

	throw new e("Cannot create an XMLHttpRequest instance");
}