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 headerHeight = document.getElementById('banner').offsetHeight;
			var contentHeight = document.getElementById('content').offsetHeight;
			if (document.getElementById('contact')) {
			  var contactHeight = document.getElementById('contact').offsetHeight;
			} else {
			  var contactHeight = 0;
			}
			var footerHeight  = document.getElementById('footer').offsetHeight;
			if (windowHeight - (contentHeight + headerHeight + contactHeight) >= 0) {
				document.getElementById('bottom').style.height = (windowHeight - headerHeight - contentHeight - contactHeight - footerHeight - 12) + 'px';
			}
		}
	}
}
window.onload = function() {
	setFooter();
}
window.onresize = function() {
	setFooter();
}