Objective Pointer

Hey guys,

I want to make a sort of arrow at the top of my screen, which points in the directions of the objective object.

So far, I have this script. It just rotates the object to look at the objective:

 var target : Transform;
 
 function Update() {
 transform.LookAt(target);
 }

But i can't seem to rotate a gui object, (which is a bit stupid, because i take it that gui can't be rotated, but i don't know how to get a sort of arrow game object up the top, in which can rotate to face the objective....

All answers are greatly appreciated!

-Grady