<?php $menuHelper = Mage::helper('megamenu'); ?>
<?php $menuData = $menuHelper->getMenuData(); extract($menuData); ?>
<ul class="menu side-menu">
    <?php echo $menuHelper->getMenuContent(); ?>
</ul>
<script type="text/javascript">
//<![CDATA[
var SW_MENU_POPUP_WIDTH = <?php echo $_popupWidth; ?>;
jQuery(function($){
    $('.menu.side-menu').et_menu({
        type: "default"
    });
});
//]]>
</script>