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 topareaHeight = 170;
			var headerHeight = document.getElementById('header1').offsetHeight;
			//alert(headerHeight);
			var contentHeight = document.getElementById('content').offsetHeight;
			//alert(contentHeight);
			var menuHeight = document.getElementById('menu').offsetHeight;
			//alert(menuHeight);
			var blockHeight = headerHeight+contentHeight;
			if(menuHeight > blockHeight) blockHeight = menuHeight;
			var footerElement = document.getElementById('footer');			
			footerElement.style.position = 'absolute';
			footerElement.style.top = (topareaHeight+blockHeight) + 'px';	
		}
	}
}
window.onload = function() {
	setFooter();
}
window.onresize = function() {
	setFooter();
}