// JavaScript Document
var request = false;
try {request = new XMLHttpRequest();} 
catch (trymicrosoft) 
{
	try {request = new ActiveXObject("Msxml2.XMLHTTP");} 
	catch (othermicrosoft) 
	{
		try {request = new ActiveXObject("Microsoft.XMLHTTP");} 
		catch (failed) 
		{request = false;}
	}
}
if (!request)
alert("你的浏览器不支持异步处理技术，请及时升级！");