Random frame: To display background

I have a movie clip placed on the first frame within the main timeline.

  • The movie clip contains 4 frames, each frame has a different image.

  • I want to display one of these frames at random every time the game loads.

  • What script would i need to target a random frame within this movieclip?

  • Would this script be placed on the main timeline?

Any help, much appreciated
Cheers
Peter.D
chockybickyman@hotmail.com