[f8] Movie clip on main timeline not playing correctly

[gwnh]

Hi Everyone,

On four consecutive frames of the main timeline I've put a separate movieclip on each frame and would like each of the movie clips to play once, then stop and then proceed to the next frame of the main timeline and play the next movieclip, and so. For some reason all the movie clips seem to play at once and I can't figure out why.

I've attached the file, and wondered if someone could take a look to see what might be going on?

Any help much appreciated.

Thanks