Cs4 frame loop help

Hey Hey.
I am makeing an animation with Cs4 Actionscript 3.0. My animation is around 400 frames long, And I would like to repeat frames 200-300 say 5 times then continue with frame 301. I have found few scripts what would do this but none of them worked. I have tryed to figure this out for over a week now with no success.

If someone knew how to this it would be a great help. Thankyou.