to = '';
function showMenu (menu) {
	// nascondo tutti i menu
	document.getElementById('menu_scuola').style.display = 'none';
	document.getElementById('menu_compagnia').style.display = 'none';
	document.getElementById('menu_teatri').style.display = 'none';
	if (to > 0) eleminaTimeoutMenu();
	
	var idMenu = 'menu_'+menu;
	elemMenu = document.getElementById(idMenu);
	elemMenu.style.display = 'inline';
	elemMenu.parentNode.onmouseout = function () {
		to = window.setTimeout('hideMenu("'+idMenu+'");',10000);
	}
	lastOpenMenu = idMenu;
}

function hideMenu (idMenu) {
	document.getElementById(idMenu).style.display = 'none';
	eleminaTimeoutMenu();
}

function eleminaTimeoutMenu () {
	clearTimeout(to);
}