Problem with flash presentation

Hello, I´ve created a flash presentation. It displays in full screen.
You can think of it like a power point presentation.
Where each slide would be a new movie that loads on top of the one before.

Let´s say I have 2 movies, where 2 loads on top of 1.
The problem is that when I load movie 2 on top of movie 1 (they are the same size, movie 2 covers the whole stage), the button (link) that was used in movie 1 to load movie 2, is still active even though movie 1 is hidden below movie 2. Movie 2 does have a background layer that covers the whole stage.

How could I avoid that?

thanks, Marcelo.

PS: Please let me know if I wasn´t clear enough.