PHP Form

I used the tutorial located at http://www.kirupa.com/web/php_contact_form.htm to create an e-mail form for our church website. If I wanted to create multiple questions each with its own set of radio buttons, how would I code that in PHP? I understand how to code it with one set of radio buttons (based on the tutorial), but I don’t know how to code more than one set of radio buttons. Any help would be great! Thanks!