//open / close tab per i forms
function apriTab(elem) {
	document.getElementById(elem).style.display="block";
	document.getElementById(elem+'_open').style.display="none";
	document.getElementById(elem+'_close').style.display="block";
}
function chiudiTab(elem) {
	document.getElementById(elem).style.display="none";
	document.getElementById(elem+'_open').style.display="block";
	document.getElementById(elem+'_close').style.display="none";	
}