Xml-feeded flash gallery help

so i have followed this tutorial:
http://www.kirupa.com/developer/mx2004/xml_flash_photogallery.htm

and i have came out with a nice result wich i will adjust a bit more to fit a site i’m building.
but that’s not what i’m here for…
i’ve got a problem with this very nice tutorial. the problem is that this gallery doesn’t seem to support any filetypes next to JPG’s, i usually use PNG’s for better quality, so i wonder if anyone has a clue why it won’t load any other filetypes.

thanks in advance.