Reset interval timer on button

I'm building a touch screen presentation for a booth and I need to set a timer that states that if there is no activity it goes back to frame 1.

I need if possible to reset the timer if someone presses any button to start again.

I have a setInterval time set in the first frame:

var timer= setInterval(timeOut,6000);

function timeOut():Void{

gotoAndPlay(1);

clearInterval(timer);

}

A button click is:

on (press) {

    gotoAndPlay(100);

   clearInterval(timer);

}

I placed the clearinterval(timer) in the button to stop the timer but have not been able to reset.

Any help would be appreciated.