Im afraid this will not happen in the immediate future

Expect this some time next year.
#1 Only Flash player 8 supports gif/jpg
#2 Above means that we need to program a version detection scheme that overlooks gif/png if user does not have player 8. This goes for all loading modules, including sldieshow and thumbnails.
#3 Script need to be able to create thumbnails from png and gif
#4 popup needs to be modified to support png+gif