hii, Most movement you see on the web is either built with javascript or Flash. If you use javascript you don't need a special program. Flash (versions long before 10) is animation/interactivity software.If your looking for movie style animation (embedded video) most people are using After Effects or something similar.GIMP or Photoshop are really only capable of creating animated image sequences and real animation tools have come a very long way from that.
Thanks!
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