go to the template your buttons are located and add
Code:
<td width="50" height="55"><a href="search.php?do=getnew"><img src="where your button is located" width="50" height="55" border="0" alt="" /></a></td>
the code was taken from your site so i'm assuming you want the new posts button the same size and width.
Change the img src to the location where your button is located!