Roof Builder 1.0 for Maya (maya script)

Hi there, Can you tell me how to get this to work? Will it work in maya 2009? I've put it in my scripts folder, opened it in the script Ed, ctr/middle mouse dragged it to the shelf, but when i click the shelf button nothing happens. Is there something else I should be doing? Would love to use it. Any help would be greatly appreciated. thankyou, Keytay