Last week i googling for a Php photo gallery and found many. I try some of them and at last use SelectaPix Image Gallery. It seems very handy and useful to me as it is database supported. Though the instructions are very easy to implement, i found some error when i run the Gallery. It may be for that the config file is not included everywhere correctly. Then i add this line

include('includes/config.php');

to Two files (classes/top_cat.php and classes/sub_cat.php).
I add lightbox Javascript to modify the full image view. Lightbox is a simple, unobtrusive script used to overlay images on the current page. According to the instruction of lightbox Javascript keep the folders in appropriate place and then modify classes/sub_cat.php file to bring lightbox in action :D

SelectaPix Image Gallery with lightbox.