Sounds like you're looking for some sort of a CMS tool. There are a bunch of free open source ones out there. In any case you're going to need a server that supports PHP and mySQL. I would recommend Coppermine (http://coppermine-gallery.net/index.php) or Gallery (http://gallery.menalto.com/) which are pretty cool. Wordpress, Joomla and Drupal would also get the job done nicely.
