срабатывают одновременно два события

[KidsKilla]

MovieClip.prototype.playBackward = function() {
	if(!this["$playBack_mc"]){
		this.createEmptyMovieClip("$playBack_mc", this.getNextHighestDepth());
	} else {
		this["$playBack_mc"].removeMovieClip();
	}
	this["$playBack_mc"].onEnterFrame = function() {
		this._parent.prevFrame()
		if (this._parent._currentframe == 1) {
			this["$playBack_mc"].removeMovieClip();
		}
	};
};
MovieClip.prototype.playForward = function() {
	if(this["$playBack_mc"]) this["$playBack_mc"].removeMovieClip();
	this.play();
}
my4_mc.onRollOver = my3_mc.onRollOver = my2_mc.onRollOver = my1_mc.onRollOver = function () {
	if(_global.currentMc) _global.currentMc.playBackward();
	this.playForward();
	_global.currentMc = this;
}