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 allContentHeight=document.getElementById('menu').clientHeight;
			var footerElement=document.getElementById('footer');
			var footerHeight=footerElement.offsetHeight;
			if (windowHeight-(allContentHeight+footerHeight)>=0) {
				footerElement.style.top=windowHeight+'px';
			} else {
				footerElement.style.top=allContentHeight+'px';
			}
			footerElement.style.display='block';
		}
	}
}

function setSizes(){
	if (document.getElementById) {
		var menuElement=document.getElementById('menu');
		var menuContentHeight=menuElement.offsetHeight;
		var allContentHeight=document.getElementById('content').offsetHeight;
		var imagesElement=document.getElementById('images');
		if (menuContentHeight-allContentHeight>=0) {
			menuElement.style.height=menuContentHeight+'px';
			imagesElement.style.height=menuContentHeight+'px';
		} else {
			menuElement.style.height=allContentHeight+'px';
			imagesElement.style.height=allContentHeight+'px';
		}
	}
}

window.onload = function() {
	setSizes();
  	setFooter();
}
window.onresize = function() {
	setSizes();
  	setFooter();
}