This would have to be initiated from the client-side, so it's more in the realm of Javascript (or perhaps Flash or a Java applet), I would think.

Once the page/images are downloaded, the server has nothing else to do until the client asks it for something else.

Of course, if you were using Javascript to request new images from the server, you could surely use a Perl script on the server-side to send it a random image. At the NMS project you could find one such script, ready to go.

- Matt Riffle