Choose a Button in a rollout?

Hello.

I am trying to figure out how to select between two different buttons. What I want to do is when I open the button, you can “click” on a choice and it will stay orange. This part is working, but I also want to be able click on the other choice, and make the previously clicked button return to its original state (white), while making the one i choose go to orange.

Ive been trying to figure this annoying button out for quite a while. Grrrrr…

thanks for any help!!!

http://a.parsons.edu/~kirsten/kirupa/BottomNav_test.swf
http://a.parsons.edu/~kirsten/kirupa/BottomNav_test.fla