Radio button help

[momo]

Hello all,

I need some help with radio buttons. This is what I have. I have 15 groups
of radio buttons and each group contains three radio buttons which non of
them are selected.

I need a way to see which button in each group was selected. Please note
that all these radio buttons are optional, meaning it doesn't have to be
selected but if any was then I need to find out which one did.


Thanks,

Momo