Tom, glad to see you posting again. PIBB'a gif animator page is pretty quiet without your works. Hope you have more free time to play http://www.talkgraphics.com/images/smilies/smile.gif.
Yikes! I stopped wearing neon colored underwear a long time ago! http://www.talkgraphics.com/images/smilies/biggrin.gif.
But seriously, a moving zipper as a transition effect is a good idea. Have to write this down. You'll never know when it'll come in handy.