how do I create a javascript file that rotates a stack of jpgs

If you look at hbcli.org you will see rotating jpgs on the left hand column.
These were done with a Flash Generator (but not Adobe Flash).

I need a way, via a java script or actual .fla code to have all jpgs pulled from an external file.
The end user wants to change them periodically.
Each row has three rotating jpgs.