Flash Puzzle

I have need for a flash page on my web site. The site is for a non profit organization that is conducting a fund raising campaign. The page will have jig saw puzzle pieces covering a picture. As someone agrees to "buy" a puzzle piece that piece is then removed and a part of the picture is revealed, similar to the old Concentration TV game show. This continues until all the pieces have been bought and removed. So, the flash will have to be programmed so that when a visitor clicks on a particular puzzle piece they are taken to a page where they pay for the piece and then they are taken back to the puzzle page and the piece has been removed and more of the picture shows. I will need the ability to change the background picture and use this on multiple campaigns. The client wants 100 puzzle pieces but I don't know if this is reasonable and I might recommend 2, 50 piece puzzle pages.