<?php if($_menu): ?>
    <nav id="nav">
        <ol class="nav-primary">
            <?php echo $_menu ?>
        </ol>
    </nav>
<?php endif ?>

<ul>
            <li><a href="<?php echo Mage::getBaseUrl(); ?>">HOME</a></li>
            <li><a href="<?php echo Mage::getBaseUrl(); ?>aboutus">ABOUT US</a></li>
            <li><a href="<?php echo Mage::getBaseUrl(); ?>your_page">your_page</a></li>
            <li><a href="<?php echo Mage::getBaseUrl(); ?>your_page">your_page</a></li>

</ul>