Nested Movie clips?

Hi All…

I have been working on an animation and I do not seem to be able to move on.

I am using AS2 and Flash 8.

What I would like to accomplish is have an animation I created of a number of balls vibrating and moving around, to play within a confined area. What I mean is that on my stage I have created a frame which I changed into a movie clip. Now what I would like to do is have my animation of the various balls stay within the frame. I tried to place the animations of the balls into the frame movie clips but no success. Any suggestions on how I could solve this dilemma?

Thanks

Brutium