Okay this is sweet. I just found out my picture gallery supports Cooliris (formerly Piclens). Go to http://www.cooliris.com/. Install the plugin and restart firefox/IE/Safari. Then go to one of my photo albums at http://gallery.figarocastle.org, like this one. Then either click "view slideshow" on the left of the page or hover over a thumbnail till you get the arrow icon to pop up and click that. Voila, pretty sweet.

Slow computers may not like it so much.