protected function getNavigationOptions()
{
$options = new DataObjectSet();
$counter = new sfDate($this->start_date->get());
$counter->subtractMonth(6);
for ($i = 0; $i < 12; $i++) {
$options->push(new ArrayData(array('Link' => $this->ShowMonthLink($counter->format('Ym')), 'Selected' => $this->start_date->format('Ym') == $counter->format('Ym') ? 'selected="selected"' : '', 'Month' => CalendarUtil::i18n_date('%B, %Y', $counter->get()))));
$counter->addMonth();
}
unset($counter);
return $options;
}