function ControlloPWD(i, lng) {

	var re_emptyall = new RegExp("^[ ]*$");
	var re_not_all = /^([a-zA-Z0-9])+$/;

	if (lng == 'it') {
		var alert1 = "Devi inserire l\'Username";
		var alert2 = "L\'Username inserito non \u00E8 corretto";
	} else if (lng == 'en') {
		var alert1 = "The field Username is mandatory";
		var alert2 = "The field Username is wrong";
	} else {
		var alert1 = "El campo Username est\u00E1 obligatorio";
		var alert2 = "El campo Username no est\u00E1 correcto";
	}

	if ( (document.forms[i].elements[1].value == "") || (re_emptyall.test(document.forms[i].elements[1].value)) ) {
		alert(alert1);
		document.forms[i].elements[1].focus();
		return false;
	}
	if (!re_not_all.test(document.forms[i].elements[1].value)) {
		alert(alert2);
		document.forms[i].elements[1].select();
		return false;
	}

	document.forms[i].submit();
}