I just found out that there is a really cool lightbox plugin for WordPress which uses Lokes Dhakar‘s Lightbox Script.

Plugin that turns linked images into neat Javascript-powered overlay popups. This plugin includes the cool javascript done by Lokesh Dhakar and got transformed into a WordPress Plugin by me who got inspired by Frankfrom 2d-sign. Version 0.1 till 0.5 featured Lightbox1. From Version 0.6 now featuring Lightbox2.