I had developed this YUI-based slideshow to use it on the MyOwnDB.com page, and published the code in 2006, already 2 years ago. It's been used by some people, but none had feature requests, until yesterday :-)
So today I added a back button. "Wow, that's a feature!" I hear you say.
Well, the slideshow was meant to be non-interactive in the first place: you give it images, html, divs to rotate and it'll do it for you automatically. So it was not in the normal workflow of the slideshow to have a back button.
Anyway, I added it and that was enough for making a new release: version 0.4 is out!