Please help!!!

I have a movieclip symbol, let's say, of a ball bouncing with a stop(); action on frame 14.

And I have another movieclip symbol that has some text moving across the screen with a stop(); action on frame 10.

On the main time line, I'd like the ball to start bouncing on frame 2 and stop on frame 15, so I've placed it on its own layer with a keyframe on frame 2.

I want the text symbol to start on frame 6 and stop on frame 15 also, so I've placed it on its own layer with a keyframe on frame 6.

This doesn't work.

When I play it back, the visual skips wildly back and forth between the symbols.

What do I do??

I'm working in Adobe Flash CS3. ActionScript 3.0, 30 fps, Player 9 (don't know if any of that is relevant, but just in case).

Please help me, I'm desperate, I can't figure it out.

Thank you!