showmenu.js

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function showMenu(sub) {
	var subMenu = document.getElementById(sub);
	var subMenus = document.getElementsByTagName("div");
	if(subMenu.style.display == "none") {
		for(var i=0; i<subMenus.length; i++) {
			if(subMenus[i].className == "menu") {
				subMenus[i].style.display = "none";
			}	
		}
		subMenu.style.display = "block";
	} else {
		subMenu.style.display = "none";
	}
}