Root ugh

ok so Ive spent an hour trying to figure out root in as3. I have a game which consists of 5 frames.frame 1 asks if you wnat to play and that clicks thru to frame 2. I have a meter which is a movieClip, and if the meter goes to the last frame, there is an onEnterFrame listener that I want to tell the main timeline to gotoAndStop at frame 5, here is the eventlistener code:
this.addEventListener(event.ENTER_FRAME, youLoseGame);
function youLoseGame(event:Event):void {
stage.root.gotoAndStop(5);
//stage.gotoAndStop(5);
}
I dont understand how to access the main timeline, Ive tried several things anyone know? I swear I will go back into learning more about the display object but for now I need it to work!

Justin