How to assign code to buttons?

Question

the current code I have on the timeline now (where the buttons reside) is:
stop();
function playLifeboy(event:MouseEvent):void
gotoAndStop(3);
function playKrave(event:MouseEvent):void
gotoAndStop(2);
lifeboy_btn.addEventListener(MouseEvent.CLICK, playLifeboy);
krave_btn.addEventListener(MouseEvent.CLICK, playKrave);
These work fine the first time but when I return to them they don't work. (I was told I have to assign the code to the buttons, But how?)

Answer 1

OK Thanks,
I Have 2 buttons in MC named mcMovieTrans the AS for these buttons are in the MC's timeline, the code is:
stop();
function playLifeboy(event:MouseEvent):void
gotoAndStop(3);
function playKrave(event:MouseEvent):void
gotoAndStop(2);
lifeboy_btn.addEventListener(MouseEvent.CLICK, playLifeboy);
krave_btn.addEventListener(MouseEvent.CLICK, playKrave);
when the buttons are activated they go to there corresponding frames and Stop. As an example of what happens next I'll show you frame 3 which plays MC mcKraveMovie:
The AS for this timeline on Frame 45 is:
stop();
function playReturn(event:MouseEvent):void
gotoAndPlay(46);
return_btn.addEventListener(MouseEvent.CLICK, playReturn);
The AS for the timeline on Frame 90 is:
MovieClip(parent).gotoAndStop(1);
This is where the problem occurs because when this action takes place and it returns to the parent MC (mcMovieTrans) The buttons actions dont work anymore.
Thanks