function CheckUserLogin() {
  if(document.userlogin.mailaccount.value.length!=0)
  {
    if (document.userlogin.mailaccount.value.charAt(0)=="." ||        
         document.userlogin.mailaccount.value.charAt(0)=="@"||       
         document.userlogin.mailaccount.value.indexOf('@', 0) == -1 || 
         document.userlogin.mailaccount.value.indexOf('.', 0) == -1 || 
         document.userlogin.mailaccount.value.lastIndexOf("@")==document.userlogin.mailaccount.value.length-1 || 
         document.userlogin.mailaccount.value.lastIndexOf(".")==document.userlogin.mailaccount.value.length-1)
     {
      alert("Email address format is not correct!");
      document.userlogin.mailaccount.focus();
      return false;
      }
   }
 else
  {
   alert("Email can not be empty!");
   document.userlogin.mailaccount.focus();
   return false;
   }
  if(document.userlogin.Password.value == '') {
    alert('Please input your Password!');
    document.userlogin.Password.focus();
    return false;
  }
  return true;
}