Form Help

From: John Pretti (john_at_web-connected.com)
Date: 05/28/04 

To: <beginners@perl.org>
Date: Fri, 28 May 2004 11:16:02 -0500

All,
 
I have created a CGI promotion script that allows users to push files from
one server to another. By nature I know you can only select one radio
button, but how can I send an error to the user if they accidentally press
submit without selecting a radio button?
 
Thanks in advance,
John