i think i have the same one as you, may i ask where you got it? does it look like this one?
DealExtreme: $36.90 3.0" LCD Touch Screen MP4/AVI/RM/RMVB Player with 1.3MP Camera/Mini SD Card Slot/FM Radio (2GB)
if it does then i have th same mp3/mp4 as you do, the pictures say that they are removed, so i couldn't tell from them. if it is the same mp3/mp4, let me know and i'll tell you everything you might have found all you needed to know by now but i figured i'd give it a shot.