Stop Movie Clip After Navigation

Hi, It’s been a long time since I’ve used Flash, never Actionscript 3.0, so I am having some trouble with some simple things. I’ve built an HTML site with a custom Flash video player in it. The player has a simple timeline navigation going on. There is a movie on each of 3 frames. There are 3 buttons, each goes to a frame. The problem is if you go to movie one, press play it starts. If you decide you want to go to the next movie, the navigation works, but movie one keeps going (you can hear the audio). How do I make this stop?

This is the timeline. btn actions layer is the script on the navigation buttons to make them function. actions layer is just a stop(); on each frame. mov menu are the navigation buttons.

The whole thing is (semi) live here:

I don’ thave all the movies yet, so I have repeated one on as 1st and 3rd option, middle is blank, for contrast.

Thanks, sorry if this was confusing.