Here are some nice JS gallery scripts which you can use in your website to increase usability. These can scripts are good replacement of those ugly popups.

Lightbox 2

Lightbox is a simple, unobtrusive script used to overlay images on the current page. It’s a snap to setup and works on all modern browsers. It can be plugged into your websites easily. I have implemented it many website, one amongst which is my tutorial website http://www.tutorialsgarden.com/resources/

You can find demo, download and documentation of Lighbox here. Lightbox is also available as Wordpress plugin that is located here.

35mm Photo Viewer

35mm Photo Viewer is a browser-based app provides viewing of photos sorted by collection. A few different CSS-driven “skins” are also available to choose from. Thumbnails are dynamically displayed allowing for quick visual searches within a collection, and XML/XSLT functionality provides for more dynamic data sources and ease of updates. Sound effects are also added for fun where supported, and are fairly simple to modify.

Demo, download and documentation can be found here.

FrogJS Javascript Gallery

FrogJS is a simple, unobtrusive javascript gallery. It is not a replacement for other thumbnail galleries such as Lightbox JS, but rather a different way of showing galleries. This type of gallery is best used in photo stories and other places where a page-by-page gallery would normally be used.

Demo, download and documentation can be found here.

Thick Box

ThickBox is a webpage UI dialog widget written in JavaScript on top of the jQuery library. Its function is to show a single image, multiple images, inline content, iframed content, or content served through AJAX in a hybrid modal.

Demo, download and documentation can be found here.