ทำ Dependant List Menu พอกดเลือกประเภทแล้ว อีกช่องหนึ่งมันไม่ออก รบกวนช่วยดูให้หน่อยนะค่ะ

<script language="javascript">
function ListPlace(SelectValue)
{
frmMain.ddlPlace.length = 0

var myOption = new Option('','')
frmMain.ddlPlace.options[frmMain.ddlPlace.length] = myOption

mySubList = new Array();

strValue = "0";
strItem="<-------Please Select Place------->"
mySubList[0,0] = strItem;
mySubList[0,2] = strValue;

var myOption = new Option(mySubList[0,0], mySubList[0,2]) 
frmMain.ddlPlace.options[frmMain.ddlPlace.selectedIndex]= myOption

 
<?
$intRows = 0;
$strSQL = "SELECT * FROM place ORDER BY id_place 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 = <?=$objResult["id_category"];?>;
strValue = "<?=$objResult["id_place"];?>";
strItem = "<?=$objResult["name_place"];?>";
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]) 
frmMain.ddlPlace.options[frmMain.ddlPlace.length]= myOption                  
}

<?
}
?>                                                                  

}

</script>
form action="page.php" method="post">
      <td width="391" height="33"><div align="center" class="style4">กรุณาเลือก</div></td>
   	</tr>
    <tr>
	<form name="frmMain" action="" method="post">
      <td height="43"><span class="style4">ประเภทสถานที่ :</span> <select name="ddlCategory" id="ddlCategory" onChange = "ListPlace(this.value)">
		<option value="default"><--Please Select Category--></option>
        <?
			$strSQL = "SELECT * FROM category_place ORDER BY id_category ASC";
			$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
			while($objResuut = mysql_fetch_array($objQuery))
				{
		?>
				
				<option value ="<?=$objResuut["id_category"];?>"><?=$objResuut["name_category"];?></option>
		<? }
		?>
	  </select>        </td>
    </tr>
    <tr>
      <td height="42"><span class="style4">สถานที่ : 
        </span>        <select id="ddlPlace" name="ddlPlace">
		<option value=""><-------Please Select Place-------></option>
      </select>        </td>
    </form></tr>
    <tr>
      <td height="32"><span class="style4">ประเภทสถานที่ ที่ต้องการ : 
        </span>        <select name="category_place2">
		<option value="default"><--Please Select Category2--></option>
		<?
			$strSQL = "SELECT * FROM category_place ORDER BY id_category ASC";
			$objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
			while($objResuut = mysql_fetch_array($objQuery))
				{
		?>
				
				<option value ="<?=$objResuut["name_category"];?>"><?=$objResuut["name_category"];?></option>
		<? }
		?>
      </select>      </td>
    </tr>
    <tr bordercolor="#993300">
      <td height="35"><label>
        <div align="center">
		
          <input type="submit" value="OK" />
        </div>
      </label></td>
    </tr>
  </table>