function submenu(){
	var submenu = document.getElementById('submenu');
	for (i=0; i <= submenu.childNodes.length; i++){
		if (submenu.childNodes[i] && submenu.childNodes[i].nodeName == "LI") {
			submenu.childNodes[i].onclick = showsub;
		}
	}
}
function showsub() {
	var submenu = document.getElementById('submenu');
	var thClass = this.className;
	for (i=0; i <= submenu.childNodes.length; i++){
		if (submenu.childNodes[i] && submenu.childNodes[i].nodeName == "LI") {
			if (submenu.childNodes[i].childNodes[2]) {
				submenu.childNodes[i].childNodes[2].style.display = "none"; 
				submenu.childNodes[i].className = ""
			}
		}
	}
	if (thClass == 'current') return;
	if (this.childNodes[2] && (this.childNodes[2].style.display == "none")) {
		this.childNodes[2].style.display = "block";
		this.className = "current";
	}
}
window.onload = submenu;