Hmm, HD44100fs? i wonder if thats like the HD44700, which is a very very common lcd control chip, and almost all lcd software is written to work with it.
Although i dont know what the 28 pins are for, as most HD44700 lcds have about 16 pins.
try a search on google for the screen number, and the different chip numbers. also, for more info on standard hd44700 screens and hooking them up, search for hd44700 interface or something similar.