Just insert this where you want the thumbs to appear:
<%GALLERIES
HASTHUMB 1
TYPE Submitted
CATEGORY Mixed
AMOUNT 16
GETNEW True
ORDER Approve_Stamp
REORDER Build_Counter
HTML Thumb
INSERT
{
LOCATION +4
HTML </tr><tr>
}
%>
And have this in your template:
<%TEMPLATE
NAME Thumb
HTML <td><a href="##Gallery_URL##" target="_blank"><img src="##Thumbnail_URL##" border="0" alt="Thumb"></a></td>
%>