$('#phone-1').autotab({ target: 'phone-2', format: 'numeric' });
$('#phone-2').autotab({ target: 'phone-3', format: 'numeric', previous: 'phone-1' });
$('#phone-3').autotab({ previous: 'phone-2', format: 'numeric' });

$('#fax-1').autotab({ target: 'fax-2', format: 'numeric' });
$('#fax-2').autotab({ target: 'fax-3', format: 'numeric', previous: 'fax-1' });
$('#fax-3').autotab({ previous: 'fax-2', format: 'numeric' });