Plz me to figure out infinite menu in portfolio section of www.projector.s

I looking for and infinite menu (not exactly bcoz it stops on both side at the end) and also stops on the mouse over of the btn. I could figure out something with hover caption effect on it. bt not having like it is there in portfolio of http://www.projector.se/flash/index.html

Hope some one will surely help me out in this. I tried to serach in the forum bt could not trace it how.

See the file attached.