Trying to get my head around VB nav bar popups

[MrEyes]

EDIT: Forget it I am an idiot, it was working all along - to cut a long story short it wasn't poppining up where I was expecting it to

I need to totally restructure the default VB navigation bar to fit the needs of my site. A simple task thinks I. The truth is it isn't as simple as I thought.

To make things easier for me, I decided to start simple and create the following very basic nav bar markup:

<!-- nav buttons bar -->
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="0" border="0" width="100%" align="center" style="border-top: 1px solid #999999; border-left: 0px; border-right: 0px; border-bottom: 1px solid #999999">
	<tr align="center">
		<td id="navbar_item1" class="vbmenu_control"><a href="$show[nojs_link]#navbar_item1" accesskey="3">Item 1</a> <script type="text/javascript"> vbmenu_register("navbar_item1"); </script></td>
	</tr>
</table>
<!-- / nav buttons bar -->

<!-- nav popup divs -->
<div class="vbmenu_popup" id="navbar_item1_menu" style="display:none">
	<table cellpadding="4" cellspacing="1" border="0">
		<tr>
			<td class="thead">Popup Header</td>
		</tr>
		<tr>
			<td class="vbmenu_option"><a href="#">Link 1</a></td>
		</tr>
		<tr>
			<td class="vbmenu_option"><a href="#">Link 2</a></td>
		</tr>
	</table>
</div>
<!-- / nav popup divs -->

When this is displayed my navbar has a single entry title "Item 1", which is good. It also has the drop down arrow next to it, also good. However the pop-up does not appear when the item or the arrow is clicked nor do I see any javascript errors.

So what am I missing here?