Just add this module to a page and upload your images. Thats all it takes.
The module will "remember" the last settings used on any other page and will use that as its default.
This way all your image galleries will have the same look & feel.
The module uses the jQuery Fancybox script by default. If you need to use another lightbox you can simply tell the module not to include its built in Fancybox scripts. A definable "rel" and "class" setting allows you to use almost any lightbox script available.
This module has possible issues with newer jquery Versions. A newer and better module (Minigal-V2) is abailable.