Waypoints jQuery Plugin Makes Scrolling Easy

Waypoints is a small jQuery plugin that makes it easy to execute a function whenever you scroll to an element. Waypoints makes a solid base for modern UI patterns that depend on a user’s scroll position on the page.

Waypoints is dual licensed under the MIT and GPL licenses. It has been tested with jQuery versions 1.4+ in IE6+, FF3+, Safari 4+, and Chrome 6+.

Requirements: jQuery Framework
Demo: http://imakewebthings.github.com/jquery-waypoints/
License: MIT, GPL License