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 siteHeight = document.getElementById('site').offsetHeight;
			var footerHeight = document.getElementById('footer').offsetHeight;
			var prefooterHeight = document.getElementById('prefooter').offsetHeight;
			var footerElement = document.getElementById('prefooter');				
			if (windowHeight > siteHeight) {
				// footerElement.height = (windowHeight - siteHeight + prefooterHeight) + 'px';
				footerElement.style.paddingTop = (windowHeight - siteHeight + prefooterHeight -22) + 'px';
			}
			else {
				footerElement.height = '22px';
			}                	
		}
	}
}