Basic trigonometry help

[Scorpion990]

I have an arrow, and I want it to spin according to where the mouse is:

code:

---

onClipEvent (enterFrame) {

	diry = _root.sign._y-_ymouse;

	dirx = _root.sign._x-_xmouse;

	angle = Math.atan2(diry, dirx);

	degrees = angle/(Math.PI/180);

	setProperty("_root.sign", _rotation, degrees);

}

---

This script doesn't exactly work . Does anybody know what is wrong with it?
Thanks!