i want to add drop down menu under main menu.

Is it possible to do drop down menus with this theme? I haven't been able to get it working either. Thanks!

I see line 88 of page.tpl.php has this code, that I guess isn't quite right?

<?php if ($main_menu): ?>
      <a class="toggle-nav toggle" href="#header_top"><img src="<?php print $base_path . $directory ?>/styles/images/icon_nav_toggle-black.gif"></a> 
      <nav class="menu_cont">
        <div class="social">
          <?php print $social_links; ?>
        </div><!--//social-->
        <?php print theme('links__system_main_menu', array(
          'links' => $main_menu,
          'attributes' => array(
            'id' => 'menu',
            'class' => array('links', 'inline', 'clearfix', 'menu'),
          ),
          'heading' => array(
            'text' => t('Menu'),
            'level' => 'h2',
            'class' => array('element-invisible'),
          )));
        ?>

Investigating further, it would be nice to have some help from the author.