[Satyr]

you might want to try one of these

http://vphotoalb.sourceforge.net/
http://gallery.menalto.com/
http://www.chezgreg.net/coppermine/
http://www.stadtaus.com/en/php_scripts/gallery_script/
http://devscripts.com/viewscript.php?sId=2095
http://www.hotscripts.com/PHP/Scripts_and_Programs/Image_Galleries/index.html

Getting them integrated with x-cart would be the diffacult part.