function getWindowHeight() {
	var windowHeight = 0;
		if (typeof(window.innerHeight) == 'number') {
			windowHeight = window.innerHeight;
		}
		else {
			if (document.documentElement && document.documentElement.clientHeight) {
				windowHeight = document.documentElement.clientHeight;
			}
		else {
			if (document.body && document.body.clientHeight) {
				windowHeight = document.body.clientHeight;
				}
			}
		}
	return windowHeight;
	}
function setFooter() {
		if (document.getElementById) {
			var windowHeight = getWindowHeight();
			if (windowHeight > 0) {
				var contentHeight = document.getElementById('hack').offsetHeight;
				var footerElement = document.getElementById('footer');
				var footerHeight  = footerElement.offsetHeight;
			if (windowHeight - (contentHeight + footerHeight) >= 0) {
				footerElement.style.top = (windowHeight - (contentHeight + footerHeight)) + 'px';
				}
		else {
			footerElement.style.top = '0px';
				}
			}
		}
	}
window.onload = function() {
		setFooter();
	}
window.onresize = function() {
		setFooter();
	}