jScroll is a jQuery plugin for infinite scrolling (lazy loading)
jScroll is a jQuery plugin for infinite scrolling, written by Philip Klauzinski. 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. The new content can be loaded automatically each time you scroll to the end of the existing content, or it can be triggered to load by clicking a navigation link at the end of the existing content.
For example, when you scroll to the bottom of some pages, new content will often load automatically, or you will be given a link to "Older Posts" which will load more content when clicked. This is called infinite scrolling.