[KiL33]

Пробуй так

function skipFrame_f(obj:Object, skipFrame:Number) {
	obj.onEnterFrame = function() {
		this.gotoAndStop(this._currentframe + skipFrame);
		if (this._currentframe == this._totalframes) {
			this.gotoAndStop(1);
		}
	};
}
//
btn_add.onPress = function() {
	if (skipFrame == undefined) {
		skipFrame = 1;
	}
	skipFrame++;
	skipFrame_f(_mc, skipFrame);
};
//
btn_del.onPress = function() {
	if (skipFrame == undefined) {
		skipFrame = 1;
	}
	if (skipFrame == 0) {
		skipFrame = 0;
	}else{
	skipFrame--;
	}
	skipFrame_f(_mc, skipFrame);
};

_mc-твой мувик с анимацией