well if you just use the gba exploader it is very easy to play gba roms.
and to the expansion pack thingy... um it should work but ill google it and see if it works. ill check back in later.
anything and everything youll need will be in the ez flash 3 in 1 wiki on this site.
http://wiki.gbatemp.net/wiki/index.php?tit..._for_EZ-Flash_V
its very informative actualy.
try the gba exploader
oh and by the way even though 1.4 firmware for edge works for the browser it only half works...