You will need one of the following tools to use this mod:

Spark!
~or~
Img2.0

Simply install like you would any other mod. Open GTA3img, find the file to replace, export a back up always, delete the file in the img file, insert the new one. Close. Play.

This will be part of a whole package. I'm going to wait and see how many other billboards get made;)

dertyjerzian@yahoo.com for w/e.