This is typically done, not using "stacked" images, but with "stored" images
(using JavaScript). You create an array of images using JavaScript (in
memory), and set up a timer to swap them out to an Image tag in the page,
one at a time. You should Google "JavaScript Image Swap" for more
information.
--
HTH,
Kevin Spencer
Microsoft MVP
..Net Developer
What You Seek Is What You Get.