This script allows you to change the page background periodically, like a slideshow. I won't get into the details of how it works, but I'll show you how to use it.
You can change delaySeconds to any number greater than 0, that's the time between slides.
You can change shuffle to either true (random order) or false (in a repeating sequence).
The image files are specified by "prefix" and "files". Prefix is the part of the URL that the images have in common. Files are the parts of the URL that are different for each file. So it's recommended to upload all your images to the same folder on the server, and use the same image hosting server for all the images.
If you want to see an example of this in action, check out my page at http://avatars.imvu.com/Cheri
I haven't figured out how to do slide transition effects yet - I'm working on that now!