You should change this
while(enum.hasMoreElements())
{
String upid = (String)enum.nextElement();
String upname = (String)enum.nextElement();
%>
<tr>
<td>
<input type="radio" name="idradio" selected="false" value="<%= upid %>" />
</td>
<td>
<% out.println(upid);%> </td>
<td>
<%out.println(upname);%> </td>
</tr>
<%}
%>
to this
<input type="hidden" name="uptime" value="" >
<%
while(enum.hasMoreElements())
{
String upid = (String)enum.nextElement();
String upname = (String)enum.nextElement();
%>
<tr>
<td>
<input type="radio" name="idradio" selected="false" value="<%= upid %>" onclick="javascript:myForm.elements['upname']='<%= out.println(upname);%>' " />
</td>
<td>
<% out.println(upid);%> </td>
<td>
<%out.println(upname);%> </td>
</tr>
<%}
%>
This would assign selected upname to the hidden field upname where myForm is the id the your form.