Infinite scrolling; also known as lazy loading, endless scrolling, autopager, endless pages, etc.; is the ability to load content via AJAX within the current page or content area as you scroll down.
http://makitweb.com/load-content-on-page-scroll-with-jquery-and-ajax/
http://jscroll.com/
http://makitweb.com/load-content-on-page-scroll-with-jquery-and-ajax/
http://jscroll.com/