var http_request=false;
  function send_request(url){
    http_request=false;

	if(window.XMLHttpRequest){
	 http_request=new XMLHttpRequest();
	 if(http_request.overrideMimeType){
	   http_request.overrideMimeType("text/xml");
	 }
	}
	else if(window.ActiveXObject){
	 try{
	  http_request=new ActiveXObject("Msxml2.XMLHttp");
	 }catch(e){
	  try{
	  http_request=new ActiveXobject("Microsoft.XMLHttp");
	  }catch(e){}
	 }
    }
	if(!http_request){
	 window.alert("创建XMLHttp对象失败！");
	 return false;
	}
	http_request.onreadystatechange=processrequest;
    http_request.open("GET",url,true);
	http_request.send(null);
  }
  function processrequest(){
   if(http_request.readyState==4){
     if(http_request.status==200){
	  document.getElementById(reobj).innerHTML=http_request.responseText;
	 }
	 else{
	  alert("您所请求的页面不正常！");
	 }
   }
  }
  function dopage(obj,url){
   document.getElementById(obj).innerHTML='<img src="/images/loading.gif">';
   send_request(url);
   reobj=obj;
   }