Ajax (Asynchronous JavaScript and XML) allows You to make a lot of nice effects. Using rico and prototype libraries it is very simple to write some funnny game like this.
I wrote this javascript game in a few thanks to a removed post on http://www.janeirostudio.com website and the ImageMagik command
$ convert orchis_360.jpg -crop 90×90 orchis
to split the main image into 16 sub-images.