How do I require one checkbox out of a group of related ones to be chosen?

How do I require one checkbox out of a group of related ones to be chosen?

I have a form which has five related checkboxes. My user can choose one or more of the five checkboxes but I need to ensure that he selects *at least* one. I don't care which one(s) he checks as long as he checks at least one of the five. How do I do that in jQuery?

I realize I'm going to have to test if any of the checkboxes have been checked but I can't figure out which field to associate the edit with since no specific checkbox has to be selected. Do I associate it with the Submit button instead?