Timer in Flash - How to stop it?

Answer 1

Hello,
I am learning how to make a timer to my game. It is something like "Who wants to be a millionaire?" I have 15 questions. There is timer for each question:60 seconds.... When I click on an answer I go on next frame, but my timer does not stop. What should I add ( and where ) to stop my timer when I clik an answer? My code for the timer is:

timer = 60;
countdown = function(){
_root.timer--;
if(_root.timer<=0){
gotoAndPlay(20); stop();
}
}
countdownInterval = setInterval(countdown,1000);