You will notice that I've switched the usual position of the navigation bar on this page from the top to the bottom. That's because JavaScript 1.2 numbers graphics on the page from the top down. That meant that if the bar was in its normal position, I'd have had to rewrite the script, or the graphics that were switched would be the incorrect ones. I took the easiest path. It should be noted that similar scripts appear in a pop-up window, which obviates the problem.
Script by Mattias Sjöberg... Personal Homepage