Put this where you want it in the navbar.

<td id="drop_down" class="vbmenu_control"><a href="$show[nojs_link]#drop_down">Title Here</a> <script type="text/javascript"> vbmenu_register("drop_down"); </script></td>


Then in the navbar template find:

<!-- / NAVBAR POPUP MENUS -->

Above Add:

<!-- drop_down popup menu -->
	<div class="vbmenu_popup" id="drop_down_menu" style="display:none">
		<table cellpadding="4" cellspacing="1" border="0">
		<tr><td class="thead">Title Here</td></tr>
		<tr><td class="vbmenu_option"><a href="url1">linktitle1</a></td></tr>
		<tr><td class="vbmenu_option"><a href="url2">linktitle2</a></td></tr>
		<tr><td class="vbmenu_option"><a href="url3">linktitle3</a></td></tr>
		<tr><td class="vbmenu_option"><a href="url4">linktitle4</a></td></tr>                          
                <tr><td class="vbmenu_option"><a href="url5">linktitle5</a></td></tr>		
</table>
             </div>
	<!-- / drop_down popup menu -->

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If you want to to add more drop downs you have to change the drop_down title to something else.