document.viewport Object which “lets you calculate the dimensions and position of the browser’s viewport”).
lazierLoad automatically hooks itself to the page, finds all images and only loads those appearing “above the fold” resulting in faster page loads as the images not located in the viewport, are not loaded until they appear within it (viz. when the user scrolls down).
The idea for
lazierLoad was inspired upon Lazy Load (which is built for use with jQuery), yet the code differs quite a lot.