The stuff in your first post worked fine for me. Changing from vertical to horizontal is simply a matter of changing
The problem is probably with your page. I was going to looking at your code, but when your page started popping up those annoying alert boxes, I killed the window. I also tried running it through W3's validator - here
- but that failed.
I suggest posting in the html forum, get some help getting the page working working/valid, then try the carousel again.