I made a small script to produce an animation with a series of images and JavaScript. I only tested it in Firefox 3, but I don’t see any reason why it wouldn’t work in other browsers.
Try it: http://doswa.com/projects/animate/
Download it: http://doswa.com/projects/animate/animate.zip
http://trac.sagemath.org/sage_trac/ticket/1483 inspired me to make this, since the sagenb.org server doesn’t have ImageMagick installed.