Thank you. I will look at that this afternoon.
Meanwhile, I have added some more transitions, and I think I have about enough. I added a "shift" animation (think of Cover Flow in Mac OS X), and a "cube" animation where the images are on the edges of a cube. I also finally fixed the flashing bug in the "fade" animation!

So here is the full list of options you can run it with as the third argument:

• fade
• black
• spin
• shift
• cube

What do you think?