// JavaScript Document
  var XMLHttp = {
     _objPool: [],
     _getInstance: function ()
     {
         for (var i = 0; i < this._objPool.length; i ++)
         {
             if (this._objPool[i].readyState == 0 || this._objPool[i].readyState == 4)
             {
                 return this._objPool[i];
             }
         }
 
         // IE5中不支持push方法
         this._objPool[this._objPool.length] = this._createObj();
 
         return this._objPool[this._objPool.length - 1];
     },
 
     _createObj: function ()
     {
         if (window.XMLHttpRequest)
         {
             var objXMLHttp = new XMLHttpRequest();
 
         }
         else
         {
             var MSXML = ['MSXML2.XMLHTTP.5.0', 'MSXML2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
             for(var n = 0; n < MSXML.length; n ++)
             {
                 try
                 {
                     var objXMLHttp = new ActiveXObject(MSXML[n]);
                     break;
                 }
                 catch(e)
                 {
                 }
             }
          }          
 
         // mozilla某些版本没有readyState属性
        if (objXMLHttp.readyState == null)
         {
             objXMLHttp.readyState = 0;
 
             objXMLHttp.addEventListener("load", function ()
                 {
                     objXMLHttp.readyState = 4;
 
                     if (typeof objXMLHttp.onreadystatechange == "function")
                     {
                         objXMLHttp.onreadystatechange();
                     }
                 },  false);
         }
 
         return objXMLHttp;
     },
 
     // 发送请求(方法[post,get], 地址, 数据, 回调函数)
     sendReq: function (method, url, data, callback)
     {
         var objXMLHttp = this._getInstance();
         with(objXMLHttp)
         {
             try
             {
                // 加随机数防止缓存
                 if (url.indexOf("?") > 0)
                 {
                     url += "&randnum=" + Math.random();
                 }
                 else
                 {
                     url += "?randnum=" + Math.random();
                 }
 
                 open(method, url, true);
 
                 // 设定请求编码方式
                 setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
                 send(data);
                 onreadystatechange = function ()
                 {
                     if (objXMLHttp.readyState == 4 && (objXMLHttp.status == 200 || objXMLHttp.status == 304))
                     {
                         callback(objXMLHttp);
                     }
                }
            }
            catch(e)
            {
                alert(e);
            }
        }
    }
};
function poolEnventOpenConnection(url, obj){
XMLHttp.sendReq("GET", url, null, obj);
}
function poolEnventOpenPost(url,date, obj){
XMLHttp.sendReq("post", url, date, obj);
}
function _poolEnventOpenConnection(name ,url ,obj){
var srrays = name.split(","); 
var value="";
var key="";
for(var i = 0 ,size =srrays.length;i<size;i++){
value = localParameter(srrays[i]);
key	+= srrays[i]+"="+value+"&";
}
XMLHttp.sendReq("GET", url+key, null, obj);
 }
 function localParameter(name){
var href = document.location.href;
var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
var r = href.substr(href.indexOf("?")+1).match(reg);
if (r!=null) 
return unescape(r[2]); 
return null;
}