มีปัญหาเกี่ยวกับ php-mysql-dropdownlist-listmenu ครับ

<?php
include "connect1.php";

$sql="SELECT * FROM teacher WHERE teacher_id = '".$_POST["th_name"]."' ";
?>
<table width="999" border="1" align="center" cellpadding="2" cellspacing="0" bordercolor="#FFCCCC">
<tr>
<td rowspan="10" bgcolor="#00CCFF"><span class="style5">.
</span>
<div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div></td>
<td bgcolor="#FFFF99"><div align="center" class="style4">ธ.ศ.ชั้น </div></td>
<td bgcolor="#FFFF99"><div align="center" class="style5">๐๙.๑๐-๐๙.๕๕<br>
คาบ ๑</div></td>
<td bgcolor="#FFFF99"><div align="center" class="style5">๐๙.๕๕-๑๐.๔๐<br>
คาบ ๒ </div></td>
<td bgcolor="#FFFF99"><div align="center" class="style5">๑๐.๔๐-๑๑.๒๕<br>
คาบ ๓ </div></td>
<td rowspan="10" bgcolor="#99FF00"><span class="style5">.
</span>
<div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div></td>
<td bgcolor="#FFFF99"><div align="center" class="style5">๑๒.๓๕-๑๓.๒๐<br>
คาบ ๔ </div></td>
<td bgcolor="#FFFF99"><div align="center" class="style5">๑๓.๒๐-๑๔.๐๕<br>
คาบ ๕ </div></td>
<td rowspan="10" bgcolor="#FFCC00"><span class="style5">.
</span>
<div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div></td>
<td bgcolor="#FFFF99"><div align="center" class="style5">๑๔.๑๕-๑๕.๐๐<br>
คาบ ๖ </div></td>
<td rowspan="10" bgcolor="#FF0066"><span class="style5">.
</span>
<div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div> <div align="center" class="style5"></div></td>
</tr>
<tr>
<td bgcolor="#FFFF99"><div align="center" class="style4">ห้อง ๑ </div></td>
<td><div align="center" class="style6">
<p>ธรรม</p>
<p>
<?php

$result=mysql_query($sql);
$rs=mysql_fetch_array($result);
echo $rs["name"];
?>
</p>
</div></td>
<td><div align="center" class="style6">
<p>วิชาเลือก</p>
<p>
<?php
$result=mysql_query($sql);
$rs=mysql_fetch_array($result);
echo $rs['name'];
?></p>
</div></td>
<td><div align="center" class="style6">
<p>กระทู้+วินัย</p>
<p>
<?php
$result=mysql_query($sql);
$rs=mysql_fetch_array($result);
echo $rs['name'];
?></p>
</div></td>
<td><div align="center" class="style6">
<p>พุทธประวัติ</p>
<p>
<?php
$result=mysql_query($sql);
$rs=mysql_fetch_array($result);
echo $rs['name'];
?></p>
</div></td>
<td><div align="center" class="style6">
<p>คอมพิวเตอร์</p>
<p><?php
$result=mysql_query($sql);
$rs=mysql_fetch_array($result);
echo $rs['name'];
?></p>
</div></td>
<td><div align="center" class="style6">
<p>ศาสนปฏิบัติ</p>
<p><?php
$result=mysql_query($sql);
$rs=mysql_fetch_array($result);
echo $rs['name'];
?></p>
</div></td>
</tr>
</table>