function checknull (wNumForm, wNumName) {

	var wNumValue = document.forms[wNumForm].elements[wNumName].value;

	var wFNum=/(^\d+$)|(^\d+\.\d+$)/ ;
	var wINum=/(^\d+$)/ ;
	ok = true;

	if ( wNumValue.length < 1 ) {
		ok = false;
		alert("I dati obbligatori ( nome, indirizzo, cap, cittą, telefono, email, p.iva/cod.fisc.) non sono completi !");
		document.forms[wNumForm].elements[wNumName].focus();
		document.forms[wNumForm].elements[wNumName].select();
	}

	return (ok);
}