Sound on/off

Hi there
I have a flash movie with a song in one of the layers synchronized to the animation.

I’d like to add a sound on/off button in case people don’t want to hear the music… Just wondering if it’s possible to accomplish this with the sound on the timeline… rather than being externally loaded…

Also, to clarify, I don’t want the animation to stop if they do stop the sound… Just the music should end… the animation should continue.

Thanks