function change(n,i) {
	if (document.getElementById(n).className == "menu-on") { 
		document.getElementById(n).className = "menu-off";
		if (i != "") {
			document.getElementById(i).style.display = "none";
		}
	} else {
		document.getElementById(n).className = "menu-on";
		if (i != "") {
			document.getElementById(i).style.display = "block";
		}
	}
}