Something

merker;
MovieClip.prototype.buttonControl = function() {
	this.onRollOver = function() {
		this.gotoAndStop(2);
	};
	this.onRollOut = function() {
		this.gotoAndStop(1);
	};
	this.onPress = function() {
		_root.merker.enabled = 1;
		_root.merker.gotoAndStop(1);
		this.enabled = 0;
		_root.merker = this;
	};
};
play_mc.buttonControl();
stop_mc.buttonControl();