Drawing Api

Hi!

I need some help with my script. I got three objects called “a”, "b "and “c”.
Why are this script not working:

_root.onEnterFrame = function() {
_root.createEmptyMovieClip(“Holder,1”);
Holder.lineStyle(5,0,100);
Holder.beginFill(0x00ff00,50);
Holder.lineTo(_root.b._x,_root.b._y);
Holder.moveTo(_root.a._x,_root.a._y);
Holder.lineTo(_root.c._x,_root.c._y);
Holder.moveTo(_root.a._x,_root.a._y);
Holder.lineTo(_root.b._x,_root.b._y);
Holder.moveTo(_root.c._x,_root.c._y);
Holder.endFill();
};

Thanks,
Albert