//Global vars
var timeout     = 500;
var closetimer	= 0;
var menuitem    = 0;

function menu_show(id) {	
	//cancel close timer
	cancelclosetime();

	//close old layer
	if(menuitem) {
		menuitem.style.display = 'none';
		menuitem.style.visibility = 'hidden';
	}

	//get new layer and show it
	menuitem = document.getElementById(id);
	menuitem.style.display = 'block';
	menuitem.style.visibility = 'visible';
}

function menu_hide() {
	if(menuitem) {
		menuitem.style.display = 'none';
		menuitem.style.visibility = 'hidden';	
	}
}

function closetime() {
	closetimer = window.setTimeout(menu_hide, timeout);
}

function cancelclosetime() {
	if(closetimer) {
		window.clearTimeout(closetimer);
		closetimer = null;
	}
}
//close layer when click-out
document.onclick = menu_hide;