window.onload = function(){
	var navigation = document.getElementById("nav");
	var subNavigation = document.getElementById("subNav");
	var links = navigation.getElementsByTagName("a");
	var fullNav = document.getElementById("fullNav");
	for (var i=0; i<links.length; i++){
		links[4].onmouseover = function(){
			subNavigation.style.display = "block";
		}
		if (i!=4){
			links[i].onmouseover = function(){
				subNavigation.style.display = "none";
			}
		}
	}
}