Playback movieclip backwards on rollout

This should be easy but i can’t get it to work right. It plays the movie clip on rollover just fine but what is the conditional statement i use to play the movie clip backword on roll out. I want the movie clip to play prevframe until it hits frame 1. The logic sounds easy but i cant get the syntax right.

on (rollOver) {
_root.myClip.play();
}
on (rollOut) {
//what goes here?
}

thanks,