Unload a movie?

I have a bunnch of buttons that load external JPEGS into a viewing area. How do I get the picture to unload from my empty container as my movie transitions - on the outward animation. My entire flash movie is comprised of several SWFs that have intro and outro animations. Now, when I’m done with this page, and you click to go to another, I want to unload the movie (JPEGS) that are on the stage.

Thanks in advance.