XML Gallery (advance 10 images)

Hello everyone. I am new to this stuff so bare with me. I set up a gallery site for an artist using the XML tut. and now the client is asking that I add buttons to advance more than just one image at a time. So… 1 fw. and 1 rev. button and one of each that advances 10 images instead of 1. Is this possible with this type of gallery? My understanding from reading the final page of the XML tut. is that this work like a ladder and only climbs one rung at a time.

Here is the orig. with the advance 10 (>>). I set this up very stupidly making it almost impossible to add new images. You wouldn’t even want to know.
http://www.christiancarlson.net

and here is the version that I created using the xml tut. Man it is slick. and easy to update.
http://www.christiancarlson.net/images.html

Sorry if this is a stupid question but I really need help since I promised that I’d be going live this week.

THANKS!!

Corey Harris