function getPXMLRequester( ){    
    var xmlPhttp_request = false;    
        try{        
            if( window.ActiveXObject ){            
                for( var i = 5; i; i-- ){               
                 try{                   
                  if( i == 2 ){xmlPhttp_request = new ActiveXObject( "Microsoft.XMLHTTP" );                       
                   }else{xmlPhttp_request = new ActiveXObject( "Msxml2.XMLHTTP." + i + ".0" );	
                   xmlPhttp_request.setRequestHeader("Content-Type","text/xml");xmlPhttp_request.setRequestHeader("Content-Type","gb2312");                
                    }
                    break;}               
                     catch(e){   
                           xmlPhttp_request = false;              
                             }          
                               }       
                      }else if( window.XMLHttpRequest ){            
                      xmlPhttp_request = new XMLHttpRequest();           
                       if (xmlPhttp_request.overrideMimeType) {                
                       xmlPhttp_request.overrideMimeType('text/xml');            
                       }       
                        }   
                         }
                         catch(e){        
                         xmlPhttp_request = false;   
                          }    
                          return xmlPhttp_request ;
    }     
  function IDPRequest() {
    //定义收到服务器的响应后需要执行的JavaScript函数
    url='/AJAXPages/PicNews.aspx'//定义网址参数
    
    xmlPhttp_request=getPXMLRequester();//调用创建XMLHttpRequest的函数        
    
       
    xmlPhttp_request.open('POST', url, false);        
    xmlPhttp_request.send(null);  
    if (xmlPhttp_request.status == 200) {
    var str = xmlPhttp_request.responseText;//将服务器返回的字符串写到页面中ID为message的区域  
       
        pic=str;  

        
    }
    //alert(pic);
    }    
    
        
IDPRequest() ;