Loop- onRollOver animation

I want to play and loop the Movieclip onRollOver and stop it onRollout. It’s simple. I know, but I have no clue*. I need help!*****

This is what I have so far on keyframe 1:**

stop();

this.onRollOver = function(){
play();
var loop:Number = 0;

}

this.onRollOut = function(){
gotoAndStop(1);

}

What am I missing?
**Help would be greatly appreciated! Thanks so much!

DK**