GoCart - Image Link?

Hi all, just after some assistance with PHP / GoCart...

I'm trying to manipulate the image loop so that the thumbnail image does not link to a separate page - I want it to generate a link directly to the large image (for use with lightbox). The loop code is below, showing what I mean.

Code:

<td>

<table class="menuItem" border="0" cellspacing="0" cellpadding="5">
<tr>
<td class="menuItemThumb" width="100" height="100" rowspan="2"><a href="[CODE FOR THE DIRECT IMAGE LINK GOES HERE]" rel="lightbox">[THUMB]</a></td>
<td width="200" height="15" valign="top" class="menuItemTitle">[TITLE]</td>
<td width="100" valign="top" class="menuItemPrice">$[PRICE]</td>
</tr>
<tr>
<td colspan="2" valign="top" class="menuItemDesc"><em>[DESCRIPTION]</em></td>
</tr>
</table>

</td>

Unfortunately my PHP skills are somewhat lacking (read: non-existent) so I was hoping someone could suggest the snippet / handler I need to get this to work??

Many thanks in advance.