Disabling buttons while a movieclip plays

Is there a way to disable buttons while a movieclip plays?

Here’s the logic in english:

If you mouse_over buttonA and buttonB, fly_mc plays.

If you mouse_over buttonC, flutter_mc plays.

While fly_mc is playing, flutter_mc cannot play, and vice versa.

How can I accomplish this? I’ve been working on this for over a week and I’m very confused! Any help would be GREATLY appreciated!