리스트에서 셀렉트박스 선택시 바로수정

<? if($is_admin == "super"){ ?>    <td width="70">     <select onchange="javascript:change_status(this, <?=$list[$i][wr_id]?>)">            <option value="1" <? if ($list[$i][wr_1]=='1') echo 'selected'; ?>>신청      <option value="2" <? if ($list[$i][wr_1]=='2') echo 'selected'; ?>>처리중      <option value="3" <? if ($list[$i][wr_1]=='3') echo 'selected'; ?>>완료     </select>    </td>    <td width="1"></td>   <? } ?>
<form id=status_update name=status_update action='/skin/board/pension_reserve/update_status.php' target='status_result' method='post'> <input type=hidden name='bo_table' value='<?=$write_table?>'> <input type=hidden name='status_val'> <input type=hidden name='wr_id'></form>
<iframe name="status_result" width="0" height="0"></iframe>
<script language="JavaScript">if ('<?=$sca?>') document.fcategory.sca.value = '<?=$sca?>';if ('<?=$stx?>') {    document.fsearch.sfl.value = '<?=$sfl?>';    document.fsearch.sop.value = '<?=$sop?>';}
function change_status(obj, wr_id) {  document.status_update.status_val.value = obj.selectedIndex; document.status_update.wr_id.value = wr_id;  document.status_update.submit();}</script>

<?include_once("./_common.php");
if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가 
$sql1  = "update $bo_table set wr_1 = '$status_val' where wr_id = '$wr_id' ";sql_query($sql1);
?><script>alert("업데이트 되었습니다."); </script>