var http_request = false;
function AjaxInit(){
	http_request = false;
	if(window.XMLHttpRequest){
		//Mozilla 浏览器
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType){
			//设置MiME类别
		   http_request.overrideMimeType("text/xml");
		}
	}
	else if (window.ActiveXObject){
		// IE浏览器
		try{
		   http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} 
		catch (e){
			try{
			  http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} 
			catch (e){}
		}
	}              
	if (!http_request){
		 window.alert("您的系统不支持后台提交的方式.");
		 return false;
	}
	else
		return true;
}
function getURL(method,url,parameter){
	var result;
	if(AjaxInit()){
		http_request.onreadystatechange = function(){
			if(http_request.readyState == 4){
				if(http_request.status == 200){
					//对返回的数据进行处理
					result = http_request.responseText;
				}
			}
		};
		http_request.open(method, url, false);
		if(parameter=='')
			http_request.send(null);
		else
			http_request.send(parameter);
		
	}
	return result;
}