Waypoints is a small jQuery plugin that makes it easy to execute a function whenever you scroll to an element.
http://imakewebthings.github.com/jquery-waypoints/
JavaScript Libraries and Functions
Get access to data on 25,048,318 websites that are jQuery Waypoints Customers. We know of 7,246,606 live websites using jQuery Waypoints and an additional 17,801,712 sites that used jQuery Waypoints historically and 686,666 websites in the United States.
Get a list of 25,048,318 websites using jQuery Waypoints which includes location information, hosting data, contact details, 7,246,606 currently live websites and an additional 799,094 domains that redirect to sites in this list. 17,801,712 sites that used this technology previouslyand 686,666 websites in the United States currently using jQuery Waypoints.
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