ช่วยดู code ให้หน่อยครับ เรื่อง dependent list menu

		function ListCustomer(SelectValue)
		{
			form1.select2.length = 0
			
			//*** Insert null Default Value ***//
			var myOption = new Option('','') 
			form1.select2.options[form1.select2.length]= myOption
			
			<?
			$intRows = 0;
			$strSQL = "SELECT * FROM `customer_list` ORDER BY cus_id ASC ";
			$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
			$intRows = 0;
			while($objResult = mysql_fetch_array($objQuery))
			{
			$intRows++;
			?>			
				x = <?=$intRows;?>;
				mySubList = new Array();
				
				strGroup = "<?=$objResult["alp_id"];?>";
				strValue = "<?=$objResult["cus_id"];?>";
				strItem = "<?=$objResult["cus_name"];?>";
				mySubList[x,0] = strItem;
				mySubList[x,1] = strGroup;
				mySubList[x,2] = strValue;
				if (mySubList[x,1] == SelectValue){
					var myOption = new Option(mySubList[x,0], mySubList[x,2])  
					form1.select2.options[form1.select2.length]= myOption					
				}
			<?
			}
			?>																	
		}
</script>

<?php
$i++;
}
?>
</table>
<table width="100%" height="35" border="0" align="center" cellpadding="5" cellspacing="5">
  <tr class="dbattribute_customer">
    <td width="2%" height="36" align="center" valign="middle" class="dbattribute_customer">No</td>
    <td width="10%" align="center" valign="middle" class="dbattribute_customer">Site</td>
    <td width="10%" align="center" valign="middle" class="dbattribute_customer">ID No.</td>
    <td width="8%" align="center" valign="middle" class="dbattribute_customer">Type of Media</span></td>
    <td width="5%" align="center" valign="middle" class="dbattribute_customer">Speed</td>
    <td width="22%" align="center" valign="middle" class="dbattribute_customer">Interface</td>
    <td width="8%" align="center" valign="middle" class="dbattribute_customer">Name of ISP</td>
    <td width="7%" align="center" valign="middle" class="dbattribute_customer">Usage</td>
    <td width="10%" align="center" valign="middle" class="dbattribute_customer">Telephone</td>
    <td width="10%" align="center" valign="middle" class="dbattribute_customer">Remote/Telnet</td>
    <td width="4%" align="center" valign="middle" class="dbattribute_customer">Edit</td>
    <td width="4%" align="center" valign="middle" class="dbattribute_customer">Del</td>
  </tr>
<?php
include("config.php"); 
	$cus_id = $_POST['select2'];
	$result= mysql_query("SELECT * FROM customer_description WHERE cus_id='$cus_id' ");
	$i = 1;
	while($dbarr = mysql_fetch_array($result)) {
?>
  <tr align="left" class="listmysql">
    <td width="2%" height="23" align="center" valign="middle"><?php echo nl2br($dbarr['no'] ) ; ?>&nbsp;</td>
    <td width="10%" valign="middle"><?php echo nl2br($dbarr['site'] ); ?>&nbsp;</td>
    <td width="10%" align="center" valign="top"><?php echo nl2br($dbarr['id_no']) ; ?>&nbsp;</td>
    <td width="5%" align="center" valign="top"><?php echo nl2br($dbarr['type_of_media']) ; ?>&nbsp;</td>
    <td width="5%" align="center" valign="top"><?php echo nl2br($dbarr['speed']) ; ?>&nbsp;</td>
    <td width="22%" align="left" valign="top"><?php echo nl2br($dbarr['interface']) ; ?>&nbsp;</td>
    <td width="8%" align="center" valign="top"><?php echo nl2br($dbarr['name_ISP']) ; ?>&nbsp;</td>
    <td width="7%" align="center" valign="top"><?php echo nl2br($dbarr['usage']) ; ?>&nbsp;</td>
    <td width="10%" align="left" valign="top"><?php echo nl2br($dbarr['telephone']) ; ?>&nbsp;</td>
    <td width="10%" align="left" valign="top"><?php echo nl2br($dbarr['remote_telnet']) ; ?>&nbsp;</td>
    <td width="4%" align="center" valign="middle"><a href="edit_IP_VPN.php?no=<?=$dbarr['no'];?>"><img src="edit.gif" width="19" height="19" align="middle" /></td>
    <td width="4%" align="center" valign="middle"><img src="delete.jpg" width="15" height="15" align="absmiddle" /></td>
  </tr>

<?php 
include("config.php");
$no = $_POST['no'];
$site = $_POST['site'];
$id_no = $_POST['id_no'];
$type_of_media = $_POST['type_of_media'];
$speed = $_POST['speed'];
$interface = $_POST['interface'];
$name_ISP = $_POST['name_ISP'];
$usage = $_POST['usage'];
$telephone = $_POST['telephone'];
$remote_telnet = $_POST['remote_telnet'];

$query = "select * from `customer_description` where no='$no'";
$result = mysql_query($query);
$dbarr = mysql_fetch_array($result);
if($site!=$dbarr['site']){
$sql = "select site from customer_description where site='$site'" ;
$result = mysql_query($sql) ;
$numrow = mysql_num_rows($result) ;
if($numrow!=0) {
echo "<br><br><center><font color=\"#cccccc\">The video title is duplicated. Please try again!!,<br>Please change the video title !!</font>" ;
echo "<br><br><< <a  href=\"javascript:history.back();\"> <font color=\"#ff3333\"> <b>  ok </b> </font> </a> >></center></body></html>" ;
exit() ;
}
}

$sql="UPDATE `customer_description` SET site='$site', id_no = '$id_no', type_of_media='$type_of_media', speed = '$speed', interface = '$interface', name_ISP = '$name_ISP', usage = '$usage', telephone = '$telephone', remote_telnet = '$remote_telnet' WHERE no = '$no'";
$result = mysql_query($sql);

if ($result) {
echo "<center><font color=\"#000000\"> Data was successfully edited !! </font><br><br><< <a  href=\"IP_VPN_contact.php\"> <font color=\"#ff3333\"><b>ok<b></font> </a> >></center>";
}
else {
echo "<center><font color=\"#000000\"> Unsuccessfully edited. Please try again !! </font><br><br><< <a  href=\"javascript:history.back();\"> <font color=\"#ff3333\"><b>ok<b></font> </a> >></center>";
}
?>
</p>

</body>
</html>