how do I get a replay button to work?

Hey everybody I can't figure out how to get my relay button to work. The effect that I want is for the timeline to play through and then a replay button appears at the end and on click you can replay the scene.

I have a button called replayBtn with an instance name of replay_btn.

In the actions layer I have this on the last frame-

stop();

function startOver(event:MouseEvent):void {
gotoAndPlay(1);
}

replay_btn.addEventListener(MouseEvent.CLICK, startOver);


But I still cannot get it to work.

Thanks