Help with sound playback

I am currently working on a flash presentation which simulates a phone automated attendant, and I am having trouble getting the sounds to function properly…I need to get the menu that is currently playing to stop when a button is pressed, and the next message to begin…currently, the sounds simply overlap, and if you click around a little you end up with a garbled mess of tracks playing. I would usually simply look up the code, but I’m on the road and I have to run this presentation in two days.
currently the sounds are loaded from the library, as the presentation will be run locally, but if this will be easier to do dynamically, I just need to know how.

if someone could help out it would be greatly appreciated.