function newXMLHttpRequest()
{
	var xmlreq = false;
	if (window.XMLHttpRequest) 
	{
		xmlreq = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) 
	{
		try
		{
			xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
        }
		catch (e1) 
		{
			try 
			{
				xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e2) 
			{
				xmlreq = false;
			}
		}
	}
	if (!xmlreq) 
	{
		alert('您的浏览器版本太低，请升级IE5.0以上');
		return false;
	}
	return xmlreq;
}