It can't be done in InDesign, as far as I can tell. Definitely not possible in interactive PDF. Might be possible in a SWF but not from InDesign. You'd have to be a Flash Professional guru do to it in SWF perhaps. Most likely to accomplish in HTML, but NOT from InDesign. Time to go for Dreamweaver or Muse.
Sweet, that's what I thought, but just wanted to make sure..... time to learn how to use Dreamweaver (: