You could do this with fairly simple scripted Flash (SWF), carried on plain HTML.
Use Flash to build the animations, with a start-on-click command for
each short loop.  Then mount the loops on the webpage... use HTML
to set up the series of pages.  

Here's an example of 'start-on-click' from my blog:

http://polistrasmill.blogspot.com/2005/10/polistra-does-miers.html

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