flash actionscript: Can anyone please help me with the following problem:

I have a movie clip on the main stage controlling music. I have also a number
of menu options and everytime I jump around in the time line (selecting
different menu option) the movie clip start playing. Since I have music in the
movie clip that means that I get multiple layers of the same musik.

What must I do to the movie clip to avoid having it start more then once?


Thanks!