Vertical Scroller for Rhamej's XML Gallery/Slideshow

I want to make the scroller vertical for this very impressive XML:

I’m sorry for posting this question in here as usually you want to keep questions of topic in the thread they concern. However, I’ve gone over the thread a couple of times, despite being asked around 10 times by various members, noone ever got around to answering it.

I’ve been trying and have been getting somewhat close to accomplishing this but I feel like I’m hacking up the code to get there. If anyone can pull this off I will be very grateful and can post the solution back in the thread for others to learn from.