If you have flash, something like that is quite easy. It is just a timed interval telling the playhead to go to the next frame containing the picture or graphics. The forward and next button do the same thing except on a press or release event. Just code a movieclip with stop action on each frame containing different graphics. Then tell the movieclip timeline to go to the next frame using setInterval. The next and back buttons would just reset the interval and send the movieclip playhead to the previous or next frame.
A mind once stretched by a new idea never regains its original dimensions.
- Oliver Wendell Holmes