Toggle switches!

So I have 4 toggle switches, one for a different music selection. When the .swf is loaded all of them are defaulted to off (down position) until the user selects their choice of music. Once on (up position), if the user selects another switch how do I make the old selection switch go to the off (down position) while the new toggle switch goes to the on (up position)?

Cheesy example…
:::::::::::::::::::::::::::::::::::
User selects #2 to play:
1 2 3 4
off on off off
:::::::::::::::::::::::::::::::::::
User now selects #4 to play:
1 2 3 4
off off off on
:::::::::::::::::::::::::::::::::::
Thanks for any help.