// java script for checking form.
<script type="text/javascript">
<!--
function checkValidable() {
 var check = 0;
 var v1 = document.loginForm.Name.value.length;
 var v2 = document.loginForm.StID.value.length;

 if (v1 < 1) {
   check = 1;
   note1.style.display = ''; // show Name's warning
 }
 else {
   note1.style.display = 'none'; // hide Name's warning
 }
 if (v2 < 1) {
   check = 1;
   note2.style.display = ''; // show StID's warning
 }
 else {
   note2.style.display = 'none'; // hide StID's warning
 }

 if (check) {
   return false;
 }
 else {
   return true;
 }
}
//-->
</script>


// begin forn
<form action="" name=loginForm onSubmit="return checkValidable()">
<table>
 <tr>
   <td>Name</td>
   <td>
<input type=text size=20 name=Name>
<div id=note1 style="display: none; color: red">Please Enter Your Name</div> // show when invalid input
   </td>
 </tr>
 <tr>
   <td>Student ID</td>
   <td>
<input type=text size=20 name=StID>
<div id=note2 style="display: none; color: red">Please Enter Your ID</div>  // show when invalid input
   </td>
 </tr>
   <td></td>
   <td>
<input type=submit name=submit value="Submit">
   </td>
 </tr>
</form>
// end form