Playing Frames Backwards

[Java.Lang]

I have a movie clip that has a button within it. Basically all I want to do is, if the user clicks on the button, the movie will play the frames backwards until it gets to a 'stop' action.
Does anyone know how this could be done?

[bellisimo]

here's the basic approach
but you'll need to figure out the right syntax
for yourself

you need to combine an onenterframe event with a gotoandstop.prevframe

onenterframe performs the function each frame
prevframe takes the playhead back on frame each time