<tr class="hr-diff-linenum">
 <td width="50%">
   &nbsp; <b><?php echo sprintf(_("Line %s"), $lefthead) ?> </b>
   &nbsp;<?php echo $headfunc ?>
 </td>
 <td width="50%">
   &nbsp; <b><?php echo sprintf(_("Line %s"), $righthead) ?> </b>
   &nbsp;<?php echo $headfunc ?>
 </td>
</tr>
