[screamge]

your_mc.onRelease = back;

function back ():Void {
	var pos:Number = your_mc._totalframes;
	this.onEnterFrame = function (){
		var newpos:Number = pos --;
		trace (newpos);
		your_mc.gotoAndStop (newpos);
		if (newpos == 0) {
			delete this.onEnterFrame;
		}
	}
}