This extension generates a simple photo gallery with one big picture and a list of thumbnails below it. When you click one of the thumbnails the big picture changes. You can also click the big picture for the original file.

The orginal version (tiny_gallery) loads all images in a javascript array, so when you got a lot of images it can take minutes before your page is loaded. I don't use any javascript it loads the big image only when you click the thumbnail.

This is how the gallery looks like with the default style: