going backwards by frame label in a mc/bttn

I created a movie clip with 2 frame labels with 10 frames each: part1, part2.
Each of both frame labels have 1 button.
The first button has a rollover to play part2.

The second button (the one is part2) has a Rollout that I want to go backwards until reaches the beginning of part2 one frame at the time. how can I do that?

Part1 has a animation that does not need to played twice. Thats why I need the button in the "part2" to go backwards to frame "10" or the beginning of part 2.

Thank you for your response dudes.

Anyone please?

place this code in a seperate layer inside the movieclip.

PHP Code:

---

var beginning:Number = 10;// this is the number that will be the beginning of your rollout frame number
var reversing:Boolean=false;
this.onEnterFrame = function() {
    if (reversing) {
        if (this._currentframe>beginning) {
            this.prevFrame();
        }
        if (this._currentframe == beginning) {
            reverse = false;
        }
    }
}; 


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place this code for the button to trigger reverse action (when you rollover)

PHP Code:

---

on (rollOver) {
    reversing = true;
} 


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thank you