Ok so I tried it and at least in the emulator it won't allow you to overplay an internet object with a button. It always pushes it to the back.

Only way I can see to get super serious on animation is to allow a static background that would be the same for every page (your flash page). Place invis buttons on the areas you need em at the time and allow the touch command to touch the button and the flash below it in some kind of dual layer simultanious tactile responce.... ok i'm rambling now.