Flash 8 - overlapping movie clips

Hi - when i tell Flash to load a movie in on top of the existing movie, how do I disable the links below while that movie is still loaded and then re-enable the links once it’s closed.

i.e - I’m clicking an image to load a enlarged version of that image directly over the top. if you accidentally click the mouse anywhere in that area it automatically reloads the same movie?

Anyway to disable the level below?