var 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){//异常，创建对象实例失败
     alert("Error initializing XMLHttpRequest!");     
}
	//处理返回信息的函数
function processrequest(){
   		if(http_request.readyState==4 || http_request.readyState=="complete"){//判断对象状态
		   close_loading("div_grey","window_box","title_box");
     		if(http_request.status==200){//信息已成功返回，开始处理信息				       
						document.getElementById(reobj).innerHTML=http_request.responseText;						
     		}else{//页面不正常
      			alert("您所请求的页面不正常！");
     		}
   		}else if (request.status == 404){
         	alert("Request URL does not exist");
		}else{
         	alert("Error: status code is " + request.status);
		}
}
function dopage(obj,url){
	reobj=obj;
	var geturl = encodeURI(url);
	geturl = encodeURI(geturl);
	loading();
	http_request.open("GET",geturl,true);
    http_request.onreadystatechange=processrequest;   
    http_request.send(null);	
} 
function deletefile(url){	
	var geturl = encodeURI(url);
	geturl = encodeURI(geturl);	
	http_request.open("GET",geturl,true);      
    http_request.send(null);	
}