Why doesn't this script work in Unity 3?

Here it is;

http://www.unifycommunity.com/wiki/index.php?title=SimpleTankController

I used it in Unity 2.6 and it was working fine. I then uninstalled all of my Unity 2.6 files and downloaded Unity 3. Since I started over with the game I was working on, it now won't work? What am I doing wrong????


Thanks so much!

Grant