Front-end Developer

CSS techniques to overlay images on a webpage.

Lightbox JS : Original; a simple, unobtrusive script used to overlay images on the current page.
Greased Lightbox : Greasemonkey/Creammonkey/Opera user script designed to enhance browsing on websites that link to images such as Google Image Search, Flickr, Wikipedia, Facebook, MySpace, and deviantART.
GreyBox : A pop-up window that doesn’t […]

script.aculo.us is a JavaScript library built on the Prototype JavaScript Framework, providing dynamic visual effects and user interface elements via the Document Object Model.
It is most notably included with Ruby on Rails, but also provided separately to work with other web application frameworks and scripting languages.
Features
script.aculo.us extends the Prototype Javascript Framework by adding visual effects, […]

MooTools is an open source, compact, and modular object-oriented programming JavaScript web application framework that is made by developers for developers. MooTools makes the process of writing extensible and cross-browser compatible code more efficient, concise and fun.
Benefits
With MooTools, the developer has the advantage of using:

An extensible and modular framework that helps give developers discretion (choice) […]