var xmlHttpuser; 
function createXMLHttpRequestuser() { 
  if (window.ActiveXObject) 
    { 
      xmlHttpuser = new ActiveXObject("Microsoft.XMLHTTP"); 
    } 
  else if (window.XMLHttpRequest) 
   { 
     xmlHttpuser = new XMLHttpRequest(); 
    } 
} 
function startRequestuser(Divid,logdiv) { 


 if (typeof(document.all.UserName) == 'undefined'  )
 {
   document.getElementById(Divid).innerHTML="<img src='images/blueloading.gif' border='0' align='absMiddle'>正在从服务器获取数据，请等待…… ";
   document.getElementById(logdiv).style.display = "none";
   
 } 
else 
  { 
    var sUserName=document.getElementById("UserName").value; 
    if (sUserName== null)
      { 
        alert("用户名不能为空！"); 
         return false; 
      }
    var sPassword=document.getElementById("UserPassword").value;
    if (sPassword== null )
      { 
        alert("密码不能为空！");
         return false; 
       } 
    document.getElementById(logdiv).style.display = "none";
    
    document.getElementById(Divid).innerHTML="<img src='images/blueloading.gif' border='0' align='absMiddle'>正在验证用户名和密码，请等待…… ";
    
    createXMLHttpRequestuser(); 
    
    xmlHttpuser.onreadystatechange = function(){handleStateChangeuser(Divid)}; 
    
     xmlHttpuser.open("post", 'VarUser.aspx?uid='+sUserName + "&upsw=" + sPassword, true); 
    
    xmlHttpuser.send(null); 

  } 


 
 
 
} 

function handleStateChangeuser(Divname) { 
  if(xmlHttpuser.readyState == 4)
   { 
      if(xmlHttpuser.status == 200) 
      { 
         document.getElementById(Divname).innerHTML = xmlHttpuser.ResponseText; 
      }else
       {
       alert("用户登陆错误");
       }
   } 
 }