This is an Elgg implementation of the jquery lazy load plugin by Mika Tuupola: http://www.appelsiini.net/projects/lazyload

The purpose of this plugin is to delay the loading of images until the page has rendered.  Then images within the browser viewport are loaded on an as-needed basis as the user scrolls.  For long pages this should decrease load times as images way down the page aren't being loaded at the same time.  If a user doesn't scroll down the page this means images aren't being loaded unnecessarily (also saving bandwidth and server resources).

Degrades gracefully for users with javascript disabled.