Code bellow should help you, good luck!
<html>
<head>
<script language="Javascript">
</script>
<script>
function selectrd(id)
{
var opt=(id==1)?"yes":"no";
var tg=document.getElementById("rd" + opt);
tg.checked=true;
}
</script>
</head>
<body>
<table>
<tr>
<td width="4%" valign="top" align="left"><font face="Times New Roman" size="3"
color="#000000">1.</font></td>
<td width="30%" valign="top" align="left" nowrap><font face="Times New Roman" size="3"
color="#000000">Select an option</font></td>
<td width="73%" valign="top" align="left">
<input id="rdyes" type="radio" name="grp" value="Yes" tabindex="1">Yes
<input id="rdno" type="radio" name="grp" value="No" tabindex="1">No</td>
</tr>
</table>
<label onclick="selectrd(1)">Select Yes</label> |
<label onclick="selectrd(2)">Select No</label>
</body>
</html>