function checkUser(){
    var user=$("artdd_txtUserName").value.Trim();
    var pwd=$("artdd_txtPwd").value.Trim();
    return submitLogin('artdd_txtUserName','artdd_txtPwd','artdd_showLogin');
}
function submitLogin(uId,pId){
    var ere=getEvent();
    var user=$(uId).value.Trim();
    var pwd=$(pId).value.Trim();
    
   if(user==""){
     alert("请输入用户名!");
    if(ere.preventDefault){ere.preventDefault();}
     else{ere.returnValue=false;}
   }
   else if(pwd==""){
     alert("请输入密码！");
     if(ere.preventDefault){ere.preventDefault();}
     else{ere.returnValue=false;}
   }
 else{  
       loading();
       var strURL="/ashx/login.ashx?user="+escape(user)+"&pwd="+escape(pwd)+"&ret="+location.href;
       Request.sendGET(strURL,recLogin,null,null,null);
   }
}
function recLogin(req){   
    afterLoading();
    var msg=req.responseText;
    if(msg=="1"){
     alert("已经登录,不能再次登录！");
    }
    else if(msg=="2"){
     alert( "密码错误！");
    }
    else if(msg=="3"){
     alert( "此用户还没有通过审核！");
    }
    else if(msg=="4"){
     alert( "用户名不存在！");
    }
    else if(msg.indexOf("http")>=0){ 
        location.href=msg;
    }
    else{
      alert(msg);
    }
}
function loading(){
 var div = $("loadingflag");
  div.style.display ="";
  div.innerHTML="正在提交...";
}
function afterLoading(){
  var div = $("loadingflag");
  div.style.display ="none";
  div.innerHTML="";
}