<?php $Cms = Mage::getModel('cms/page')->load('insert_your_identifier_here', 'identifier'); ?>
    <?php if($Cms['is_active']) : ?>
        <li role="presentation"<?php echo ($_last ? ' class="last"' : '') ?>>
            <a href="<?php echo $this->getUrl('insert_your_identifier_here'); ?>">
                <?php echo $Cms->getTitle(); ?>
            </a>
        </li>
    <?php endif; ?>