You have an empty cell between the two corner images:
<td></td>
Put a spacer gif in there or at least define the cell width and add a
That should fix the problem.
Also, FYI you can paste a template into Dreamweaver or your favorite WYSIWYG editor to help you view some of the more complex nested tables. It can't read Smarty, but it can at least give you an idea of what cell is what
