Lightbox Plus

Lightbox Plus implements ColorBox as a lightbox image overlay tool for WordPress. ColorBox was created by Jack Moore and is licensed under the MIT License. Lightbox Plus for WordPress implements ColorBox as a lightbox image overlay tool for WordPress. ColorBox was created by Jack Moore and is licensed under the MIT License. Lightbox Plus permits users to view larger versions of images without having to leave the current page. Lightbox is able to add a lightbox to WordPress gallery images, display simple slide shows, video, forms and external content in overlays. The use of the dark or light background, which dims the page over which the image has been overlaid, also serves to highlight the image or video being viewed. Lightbox Plus captures the image title for display in the overlay.

http://wordpress.org/extend/plugins/lightbox-plus/