<script type="text/javascript">
function getDocHeight() {
var D = document;
return Math.max(
    Math.max(D.body.scrollHeight, D.documentElement.scrollHeight),
    Math.max(D.body.offsetHeight, D.documentElement.offsetHeight),
    Math.max(D.body.clientHeight, D.documentElement.clientHeight)
);
}
var docheight = ( getDocHeight() ) +'px';
// alert( docheight );
document.getElementById('pusher').style.height = docheight;
</script>

<div id="pusher">This content is shown on the page</div>
<p>Anything here is below the fold of the page and you will need to scroll down to see me</p>