//创建XMLHttpRequest对象
function getXMLHttpRequest()
{
	if(window.XMLHttpRequest)
	{
		return new XMLHttpRequest();
	}
	else if (window.ActiveXObject)
	{
		request = new ActiveXObject("Microsoft.XMLHTTP");
		
		if (!request)
		{
			request = new ActiveXObject("Msxml2.XMLHTTP");
		}
		
		return request;
	}
}