Mario Game A few problems can someone plz help

Hey i have been making a mario game for the past few days.
i am having trouble with his life.
i can make his life go down with this code

if(this.hitTest(_root.mario)) {

_root.life -= 1;

}
that works fine but when his life goes to zero
look

if(_root.life == 0) {

gotoAndStop(“GameOver”)

}
i am trying to get it to goto gameover is his life points goto zero
can someone plz help me.
Thanks