<table width="100%" border="0" cellspacing="0" cellpadding="0">
   <?
$str="select * from grade where school_id=$school_id order by id asc";
   $result=mysql_query($str,$link_id);
   $i=0;
  while($rs=mysql_fetch_array($result)){
  $grade_id=$rs['id'];
?>     
  <tr>
    <td><div class="kj1">
              <table width="100%" border="0" cellspacing="0" cellpadding="0">
                <tr>
                  <td width="88%" class="word6"><?=$rs['name']?></td>
                  <td width="12%">&nbsp;</td>
                </tr>
                <tr>
                  <td colspan="2"><table width="29%" border="0" cellspacing="0" cellpadding="0">
                    <tr>
                      <?
$str="select * from class where grade_id=$grade_id order by id asc";
   $result=mysql_query($str,$link_id);
   $i=0;
  while($rs=mysql_fetch_array($result)){
?> 
 <td><table width="195" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="195" height="30"><a href="firm_list.php?class_id=<?=$rs['id']?>" target="_blank"><?=$rs['name']?></a></td>
                        </tr>
                      </table></td><? $i++; if($i%4==0){?>
                    </tr><? }?><? }?>
                  </table></td>
                  </tr>
              </table>
            </div></td>
  </tr><? }?>
</table>