Issue with the UV Scroll Script

I can’t figure out how to make this script run. It’s most likely my (nonexistant) grasp on python, but if someone would take a look, that’d be great. http://www.savefile.com/files/7227422

Just give the “speed” property a value less than 1. Using a positive or negative value will give change the direction of the scroll.
http://www.freeuploader.com/out.php/i17098_UVScroll.JPG