/* 
 * Taken from http://james.padolsey.com/javascript/get-document-height-cross-browser/
 */


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)
    );
}