function CreateXMLHTTPObject()
{
	var xObject = null;

	try 
	{
		xObject = new ActiveXObject("Msxml2.xmlhttp.4.0");
	}
	catch (e)
	{
		try
		{
			xObject = new XMLHttpRequest(); 
			if (xObject.overrideMimeType) {//设置MiME类别
				xObject.overrideMimeType('text/xml');
			}
		}
		catch (e)
		{
			try 
			{
				xObject = new ActiveXObject("Msxml2.xmlhttp");
			} 
			catch (e) 
			{
				try 
				{
					xObject = new ActiveXObject("Microsoft.xmlhttp");
				} 
				catch (e) 
				{
					alert("Error: Unable to create XML HTTP object!");
				}
			}
		}
	}

	return xObject;
}