I've been asked a couple times via email how DBGallery can be install on a system that already has MySql. The answer is simply to not choose the "Install MySql" on the setup screen. Actually the reason for having that option seperated like that, instead of simply installing it in the background, is just for this purpose.
A screenshot of the setup screen, where one would proceed directly to "Install DBGallery" if MySql is already installed:

Cheers,
Glenn
DBGallery, an excellent way to organize your photos.
Download a copy of DBGallery here:
http://grrsystems.com/DBGallery/download.htm