stranamente penso di esserci arrivato...

codice:
function calculateTotal() {
	result = (document.questions.one.value +
	document.questions.two.value +
	document.questions.three.value +
	document.questions.four.value +
	document.questions.five.value +
	document.questions.six.value +
	document.questions.seven.value +
	document.questions.eight.value +
	document.questions.nine.value +
	document.questions.ten.value +
	document.questions.eleven.value +
	document.questions.twelve.value +
	document.questions.thirteen.value +
	document.questions.fourteen.value +
	document.questions.fifthteen.value +
	document.questions.sixteen.value +
	document.questions.seventeen.value +
	document.questions.eighteen.value +
	document.questions.nineteen.value +
	document.questions.twenty.value);
	alert("Tot:"+result);
risultato: NaN.... che e'?