function find_blank_selector (form) {
	for (i = 0; i < form.elements.length; i++) {
		if (form.elements[i].value == 0) {
			return form.elements[i];
		}
	}
	return null;
}

function set_menu (form, value) {
	var s = find_blank_selector(form);
	if (s != null)
		s.value = value;
	else
		alert('You already have 4 selections. You need to clear one to select any more');
		
	return false;
}

function reset_menu (form, index) {
	form.elements[index].value = 0;
	return false;
}