radio button on contact form?

does anyone know how i can add a radio button field on the contact form?

Have not done this but believe that you can add to this file
/includes/modules/pages/contact_us/header_php.php

And may have to adjust a copy of: /includes/templates/template_default/templates/tpl_contact_us_default.php

Thanks for the reply. I tried to do this but i could not get the results in the contact form results that were emailed to me.

Do you know where I add the code in the file.

Do you know where I add the code in the file.
You did not reference what information you wanted to include or the fact that you tried this or posted what you tried. If this is information that is to be drawn from the DB or placed into the DB then there is an answer - if it is just informational, then there another answer. You only asked where to place code for radio buttons, ans this makes me assume that you have code that you know will get you what you want.

Try adding generic code to see if it displays like:

<?php
echo "Hello World!"; // This will print out Hello World!
echo "<br />Psst...You can't see my PHP comments!";
?>