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
License: MIT, GPL License