Controlling sounds in a projector

Hi everyone. I have a Flash projector which contains links to launch external Director projectors using the **fscommand(“exec”, “filename.exe”); ** script.

I also have an audio jukebox that streams external mp3 files. I want Flash to turn off the background music when another projector is loaded. Not too hard. I could just use the stopAllSounds(); on my buttons. But what I can’t figure out is how to tell the Flash when the project projector is closed and the user returns to the main Flash projector. At this point I would want the music to play again.

Here is the code used to play my background music. It is attatched to frames in a movieclip residing on the main timeline.

//stops any sounds that are playing
stopAllSounds;
//load new sound into instance of audio_holder
mySound = new Sound(audio_holder);
mySound.loadSound(“filemane.mp3”, true);

I have been all over the internet in the last 3 days and have found nothing. Any advice would be greatly appreciated.

thanks - Andy