Question : How can I make radio buttons mandatory fields?

Hi Experts,
I have these radio buttons on my page and my users tend to skip checking the No value. How could I make it mandatory? Please see the code below, what do I have to add?
Thank you.

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<html>
<head>
<title>Radio Button</title>
<script language="JavaScript" type="text/JavaScript">
<!--
function uncheckRadio() {
 var choice = document.form1.Sleepy;
 for (i = 0; i < choice.length; i++) {
  if ( choice[i].checked = true )
   choice[i].checked = false;
 }
}

function uncheckRadio1(){
 var choice = document.form1.Thirsty;
 for (i = 0; i < choice.length; i++) {
  if ( choice[i].checked = true )
   choice[i].checked = false;
 }
}

function uncheckRadio2(){
 var choice = document.form1.Hungry;
 for (i = 0; i < choice.length; i++) {
  if ( choice[i].checked = true )
   choice[i].checked = false;
 }
}

//-->
</script>
</head>

<body>

<form method="post" action="MyPage.asp">
<table>
<tr><td align="right">
<b>Are you sleepy?&nbsp;&nbsp;</b>
</td><td>
<label>
<input type="radio" name="Sleepy" value="Yes" ondblclick="uncheckRadio();"><b>Yes</b></label>
</td><td>&nbsp;&nbsp;&nbsp;
<label><input type="radio" name="Sleepy" value="No" ondblclick="uncheckRadio();"><b>No</b></label>
</td></tr>
<tr><td colspan="3">&nbsp;</td></tr>
<tr><td align="right">
<b>Are you thirsty?&nbsp;&nbsp;</b>
</td><td>
<label>
<input type="radio" name="Thirsty" value="Yes" ondblclick="uncheckRadio();"><b>Yes</b></label>
</td><td>&nbsp;&nbsp;&nbsp;
<label><input type="radio" name="Thirsty" value="No" ondblclick="uncheckRadio();"><b>No</b></label>
</td></tr>
<tr><td colspan="3">&nbsp;</td></tr>
<tr><td align="right">
<b>Are you hungry?&nbsp;&nbsp;</b>
</td><td>
<label>
<input type="radio" name="Hungry" value="Yes" ondblclick="uncheckRadio();"><b>Yes</b></label>
</td><td>&nbsp;&nbsp;&nbsp;
<label><input type="radio" name="Hungry" value="No" ondblclick="uncheckRadio();"><b>No</b></label>
</td></tr>
</table>
<input type="submit" name="Submit" id="flashingtext" value="Submit" />

</body>
</html>

Answer : How can I make radio buttons mandatory fields?

MVC is a key pattern for software development. As you know, it means responsibilities are divided between the Model (the business rules), the View (the UI) and the Controller (the user actions).

I would change your design as shown in your diagram a bit to not go to the level of a Label.

Read more here:
http://www.javaworld.com/javaworld/jw-07-2000/jw-0721-hmvc.html