function toggle(element) {
	var object = document.getElementById(element);
	if (object.style.display == 'block') {
		object.style.display = 'none';
	} else {
		object.style.display = 'block';
	}
}

function closeNav() {
	var holder = document.getElementById('mainNav');
	var elements = holder.getElementsByTagName('ul');
	for (var i = 0; i < elements.length; i++) {
		if (elements[i].className == 'subNav' || elements[i].className == 'currentSub') {
			elements[i].style.display = 'none';
		}
	}	
}

function openNav(element) {
	closeNav();
	document.getElementById(element).style.display = 'block';
}

//window.onload = closeNav;