Orbit around object script.

I found a script on the wiki that i decided to use as it looked usefull for my 2d space game:

http://wiki.unity3d.com/index.php/Simple_planetary_orbits

The problem im having with it is the object i have orbiting is going up on the Y axis instead of using the dimensions of my game (Z and X).

I have been trying for about 2 hours to understand the code but can't seem too make it orbit the right way. Anyone got any hints or can look into the script for me i will be very greatful. I already know that i need to change the velocity but i don't know how to do that in the script. Freeze contraints just breaks the script just to let you know.