A Better Image Rotator
http://www.alistapart.com/articles/betterrotator/

Benjamin, Dan
List Apart, A
2004

Abstract:

About a year ago, I wrote an article, introducing a method for displaying a random image every time someone visits a web page. Administration was simple: just add or remove images from a folder on the server, and they would appear (or disappear, respectively) from the pool of random images being displayed on that page.