คืนค่าข้อมูล จาก database mysql ใส่ Dropdown list 3 ชั้น เวลา ที่ เรา ทำกานแก้ไข ข้อมูล

<tr>
                                      <td style="text-align: right;" >MAIN-CATEGORY :</td>
                                      <td>   
                                        <select id="ddlGeo" name="ddlGeo" onChange = "ListProvince(this.value)">                                          
                                            <?php
                                            $strSQL = "SELECT * FROM maincategory ORDER BY mcat_id ASC ";
                                            $objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
                                            while($objResult = mysql_fetch_array($objQuery))
                                            {
                                            ?>
                                          <option value="<?php echo $objResult["mcat_id"];?>"><?php echo $objResult["mcat_name"];?></option>
                                            <?php
                                               }
                                            ?>
                                        </select>
                                      </td>
                                    </tr>

<script language = "JavaScript">
    //**** List Province (Start) ***//
    function ListProvince(SelectValue)
    {
      frmMain.ddlProvince.length = 0
      frmMain.ddlAmphur.length = 0
      
      //*** Insert null Default Value ***//
      var myOption = new Option('','')  
      frmMain.ddlProvince.options[frmMain.ddlProvince.length]= myOption
      
      <?php
      $intRows = 0;
      $strSQL = "SELECT * FROM subcategory ORDER BY scat_id ASC ";
      $objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
      $intRows = 0;
      while($objResult = mysql_fetch_array($objQuery))
      {
      $intRows++;
      ?>      
        x = <?php echo $intRows;?>;
        mySubList = new Array();
        
        strGroup = <?php echo $objResult["mcat_id"];?>;
        strValue = "<?php echo $objResult["scat_id"];?>";
        strItem = "<?php echo $objResult["scat_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])  
          frmMain.ddlProvince.options[frmMain.ddlProvince.length]= myOption         
        }
      <?
      }
      ?>                                  
    }
    //**** List Province (End) ***//

    
    //**** List Amphur (Start) ***//
    function ListAmphur(SelectValue)
    {
      frmMain.ddlAmphur.length = 0

      //*** Insert null Default Value ***//
      var myOption = new Option('','')  
      frmMain.ddlAmphur.options[frmMain.ddlAmphur.length]= myOption
      
      <?php
      $intRows = 0;
      $strSQL = "SELECT * FROM mainarticle ORDER BY mart_id ASC ";
      $objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");
      $intRows = 0;
      while($objResult = mysql_fetch_array($objQuery))
      {
      $intRows++;
      ?>
        x = <?php echo $intRows;?>;
        mySubList = new Array();
        
        strGroup = <?php echo $objResult["scat_id"];?>;
        strValue = "<?php echo $objResult["mart_id"];?>";
        strItem = "<?php echo $objResult["mart_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])  
          frmMain.ddlAmphur.options[frmMain.ddlAmphur.length]= myOption         
        }
      <?php
      }
      ?>                                  
    }
    //**** List Amphur (End) ***//
</script>