Startup movies removed

About a week ago I found a thread in the Aussie 3G forum about removing the Motorola and Hi3G startup movies. Inspired by the instructions there, I created three empty (black) jpg-images and used them as startup files (named .jpg). I am not sure that the startup is any faster now, but at least I don´t have to see, and what was worse, hear the annoying movies. In the future I might do personalised mp4 movies instead. But, currently I have other things to do than finding out how to create workable movies.