Grayscale
Grayscale.js is an experimental attempt to emulate Microsoft's proprietary 'grayscale' filter (available in most IE versions).
Successfully tested in Opera 9, FF2/3, Safari 4, IE6/7. It only works slightly in Safari<4 and Chrome because of their lacking support of CanvasContext.getImageData (because of this, images cannot be grayscaled).
More info: http://james.padolsey.com/demos/grayscale/
Shadowbox
Shadowbox is a web-based media viewer application that supports all of the web's most popular media publishing formats. Shadowbox is written entirely in JavaScript and CSS and is highly customizable. Using Shadowbox, website authors can showcase a wide assortment of media in all major browsers without navigating users away from the linking page.
License
Shadowbox is licensed under the terms of the Shadowbox.js License. This license grants personal, non-commercial users the right to use Shadowbox without paying a fee. It also provides an option for users who wish to use Shadowbox for commercial purposes. You are encouraged to review the terms of the license before using Shadowbox.
http://www.shadowbox-js.com/