There are 2 Affiliate Boxes. Here is the one with the Rounded Corners
Code: 
<table class="tborder" cellpadding="6" cellspacing="1" border="0" align="center" style="-webkit-border-radius:5px;-moz-border-radius:5px;border-radius:5px;">
<tbody style="-webkit-border-radius:5px;-moz-border-radius:5px;border-radius:5px;">
<tr style="-webkit-border-radius:5px;-moz-border-radius:5px;border-radius:5px;">
<td class="thead" title="Affiliates" style="-webkit-border-radius:3px;-moz-border-radius:3px;border-radius:3px;">
Affiliates
</td>
</tr>

<tr>
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</tr>
</tbody>
</table>
Just replace the Image URLs with the ones to your liking.