function showNav(element) {
	var menu = element.getElementsByTagName('UL')[0];
	if(menu) menu.style.display = "block";
	element.className = "showNav";
}
function hideNav(element) {
	var menu = element.getElementsByTagName('UL')[0];
	if(menu) menu.style.display = "none";
	element.className = "top";
}