Hi Am Rakesh, Am generating User Data List, Details Given Below.Please Help Me.

Hi Am Rakesh, Am generating User Data List, and i have assigned in the radio buttons which is shown below. I need to select each user name from radio button to edit user information. Before selecting user, if i click on the edit link it will take null values so need to validate radio button in front end and selected radio button values only should take for fetching values. this is my code
<% if(request.getAttribute("uprofile")!=null)
{ %>
<tr>
<td colspan="6" ><table width="100%" cellspacing="0" id="grid">
<tr class="head">
<th width="20">&nbsp;</th>
<th>User Name</th>
<th scope="col" abbr="Dual 2GHz"> Email</th>
<th scope="col" abbr="Dual 2.5GHz">Role</th>
<th scope="col" abbr="Dual 2.5GHz">Status</th>
<th scope="col" abbr="Dual 2.5GHz">&nbsp;</th>
</tr>
<%
 int i=0;

 Vector vuserlist=(Vector)request.getAttribute("uprofile");
 Iterator ilist=vuserlist.iterator();
 while (ilist.hasNext())
  {
   ArrayList auser=(ArrayList)ilist.next();
   Iterator ialist=auser.iterator();
   while(ialist.hasNext())
   { String username=(String)ialist.next();
   i++;

   %>

 
<tr>  
<td><input type="radio" name="rusername" value="<%=username%>" /></td>
<td id="userid"><%= username %></td>

<td><%= ialist.next() %></td>
<td><%= ialist.next() %></td>
<td><%= ialist.next() %></td>

<td><a href="#">Approve</a>&nbsp;|&nbsp;<a href="#">Deny</a></td>
</tr>
<%
}
}
}%>



</table></td>
</tr>elect