child object ignore parent rotations?

Hi, I have 2 objects and I simply want to have one object "move" with other but not rotate?

So for now i didnt do any parenting i just added a script:

Code (csharp):

1.  
2. var obj1 : GameObject;
3. private var pos : Vector3;
4.  
5. function Start () {
6.     pos = transform.position-obj1.transform.position;
7. }
8.  
9. function Update () {
10.  
11. transform.position = pos+obj1.transform.position;
12.  
13. }

Problem is I want to eventually create a multiplyer so will need these to be a single prefab, plus moving them in the editor is annoying as I have to move both.

So my question is, how do i stop the child rotating with its parent?

Thanks
Andy