function ValidateLogin()
       {
           
            var na = document.getElementById('txtUname');
            var pa = document.getElementById('txtUpass');
            var dv = document.getElementById('dvlogin');
            if(trim(na.value) == ""&& trim(pa.value) =="")
            {
                dv.style.display="";
                dv.innerHTML="·请输入会员登录名和密码！";
            }
            else if(trim(na.value) == "")
            {
                dv.style.display="";
                dv.innerHTML="·请输入会员登录名！";
            }
            else if( trim(pa.value) =="")
            {
                 dv.style.display="";
                dv.innerHTML="·请输入会员登录密码！";
            }
            else 
            {
                return true;
            }
            return false;
      }