How about this? (using jQuery)
$(document).on('keyup', 'input', function(){
if($(this).val().length >= $(this).attr('maxlength'))
{
$(this).nextAll('input:first').focus();
// OR even
// $(this).next('input').focus();
}
});
Is that what you're looking for? http://fiddle.jshell.net/C3jeY/