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(resize) {
	if (document.getElementById) {
		var windowHeight = getWindowHeight();
		if (windowHeight > 0) {
			var menuHeight = document.getElementById('menu-container').offsetHeight;
			var contentHeight = document.getElementById('middle-container').offsetHeight;
			var footerElement = document.getElementById('footer-container');
			var footerHeight = footerElement.offsetHeight;
			var offset = contentHeight + footerHeight;
			var isIE = '\v'=='v';
			
			if(resize){
				if(isIE){
					offset -= 30;
				} else {
					offset += 35;
				}
			}
			
			if (windowHeight - offset >= 0) {
				footerElement.style.position = 'relative';
				footerElement.style.top = (windowHeight - offset) + 'px';
			} else {
				footerElement.style.position = 'static';
			}
		}
	}
}
window.onload = function() {
	setFooter(false);
};

window.onresize = function() {
	setFooter(true);
};