I moved it from /maya/scripts to /maya/4.5/scripts. I had thought they were one in the same. Make shure your lights file and .mel file are together, and make shure your GI_Joe shelf icon is in your maya/4.5/extras/icons folder, or you won't be able to change your default .mel shelf button that maya provies when you drag your GI_Joe mel command from the script editor command line to the shelf where all your shelf buttons are located on the user interface.

If you don't know how to get to the shelves content window, just go to window-->/settings/preferences-->shelves. It's pretty easy to figure out.