function espande(id) {
	if (id!='prima') document.getElementById('prima').style.display = "none";
	if (id!='seconda') document.getElementById('seconda').style.display = "none";
	if (id!='terza') document.getElementById('terza').style.display = "none";
	if (id!='quarta') document.getElementById('quarta').style.display = "none";
	if (id!='quinta') document.getElementById('quinta').style.display = "none";
	if (document.getElementById(id).style.display == "block") {
		document.getElementById(id).style.display = "none";
	} else {
		document.getElementById(id).style.display = "block";
	}
}