Automated Photo Gallery

I am trying to create a website and i have most things sorted out except for the photo gallery!
I have many many pictures to post but the only thing i can think of is linking each picture individually to their thumbnails (which i also have to link manually to the gallery page!) I found a template for the gallery pages and I have been using Dreamweaver to tweak stuff. All I can think of is linking the thumbnails that i created from the larger images individually to the photo gallery template. Is there a faster way to do this? I saw something about automatic thumbnail generators that do your gallery for you and sort everything out when additional pictures are uploaded in the future.
Any help would be greatly appreciated!!!
Thank you very much in advance =)

I just started using Zen Photo. You just upload their software to your site and it will set up a gallery for you. You have to have MySQL installed beforehand. I don’t use the gallery directly on my site as the formatting is quite complex. I just call methods on the supplied classes.