You do not need javascript! Just good CSS. Set the element to be a child of <body> , position:absolute; top:100%; position:absolute; top:100%; and you have the below-fold element.
.below { position: absolute; top:100%; }
Also, unlike setting a static top or field using javascript, this will work even after resizing your browser window.
Here's jsFiddle with full markup: http://jsfiddle.net/ubhBL/
source share