function ajax_request(obj,url,wait_str){  //ajax方法来发送数据;;;obj,DOM对象的ID,URL,请求的页面,wait_str,等待时显示的字符串

  var http_req;
 if (window.XMLHttpRequest) 
 {
 http_req=new XMLHttpRequest();
 //http_req.overrideMimeType('text/xml');
 } 
 else if (window.ActiveXObject) {
 http_req=new ActiveXObject("Microsoft.XMLHTTP");
 }
 document.getElementById(obj).innerHTML=wait_str;
 http_req.onreadystatechange = function(){
   if (http_req.readyState == 4) { //状态

   if (http_req.status == 200) { //成功返回
    document.getElementById(obj).innerHTML=http_req.responseText;
   } 
   else { //返回不正常

    document.getElementById(obj).innerHTML="暂时无法获取数据";
   }
  }
 };
     http_req.open("GET", url, true);
     http_req.send(null);
  }

 function ajax_requestseek(obj,url,wait_str,obj2,vstr){  //ajax方法来发送数据;;;obj,DOM对象的ID,URL,请求的页面,wait_str,等待时显示的字符串

  var http_req;
 if (window.XMLHttpRequest) 
 {
 http_req=new XMLHttpRequest();
 //http_req.overrideMimeType('text/xml');
 } 
 else if (window.ActiveXObject) {
 http_req=new ActiveXObject("Microsoft.XMLHTTP");
 }
 document.getElementById(obj).innerHTML=wait_str;
 http_req.onreadystatechange = function(){
   if (http_req.readyState == 4) { //状态

   if (http_req.status == 200) { //成功返回
    document.getElementById(obj).innerHTML=http_req.responseText;
    setSelected(obj2,vstr);
   } 
   else { //返回不正常

    document.getElementById(obj).innerHTML="暂时无法获取数据";
   }
  }
 };
 http_req.open("GET", url, true);
 http_req.send(null);
  }

function SelectAllCheckboxes(spanChk){

   // Added as ASPX uses SPAN for checkbox
   var oItem = spanChk.children;
   var theBox= (spanChk.type=="checkbox") ? 
        spanChk : spanChk.children.item[0];
   xState=theBox.checked;
   elm=theBox.form.elements;

   for(i=0;i<elm.length;i++)
     if(elm[i].type=="checkbox" && 
              elm[i].id!=theBox.id)
     {
       elm[i].click();
       if(elm[i].checked!=xState)
         elm[i].click();
       elm[i].checked=xState;
     }
     //ShowIssueid();
 }