function popup(link, height){
  if (height == null) height = 500
  msg=open(link, 'winpopup', 'toolbar=no, directories=no, menubar=no, width=400, height='+height+', resizable=no, scrollbars=yes, left=10, top=10');
}

function checkform(){
dnomeL = window.document.forms[1].elements[0].value.length;
demailL = window.document.forms[1].elements[1].value.length;
oggettoL = window.document.forms[1].elements[2].value.length;
testoL = window.document.forms[1].elements[3].value.length;
if ( dnomeL < 1 | demailL < 1 | oggettoL < 1 | testoL < 1 )	{
	alert("Tutti i campi devono essere completati");
	return false;
	}
demailL = window.document.forms[1].elements[1].value.length;
if ( demailL > 1 ) {
	mailS = window.document.forms[1].elements[1].value;
	filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-]{2,})+\.)+([a-zA-Z0-9]{2,})+$/;
	if ( filter.test(mailS) ) {
		return true;
		}
	else {
		alert("Controllare l'indirizzo e-mail inserito");
		return false;
		}
	}
	else {
		return true;
	}
}