댓글날짜수정팁인데 오류가 나네요 채택완료

<?php if ($is_admin) { ?>        <tr>          <td style="padding-left:20px; background:url(<?php echo $board_skin_path; ?>/img/co_title_bg.gif); line-height:28px;"><form name='hp_comment_update' method='post' style='padding:0;' action="<?php echo $board_skin_path; ?>/view_comment_dateupdate.php">            <input type="hidden" name="bo_table" value="<?php echo $bo_table; ?>" />            <input type="hidden" name="wr_id"    value="<?php echo $wr_id; ?>" />            <input type="hidden" name="page"     value="<?php echo $page; ?>" />            <input type="hidden" name="sca"      value="<?php echo $sca; ?>" />            <input type="hidden" name="sfl"      value="<?php echo $sfl; ?>" />            <input type="hidden" name="stx"      value="<?php echo $stx; ?>" />            <input type="hidden" name="spt"      value="<?php echo $spt; ?>" />            <input type="hidden" name="page"     value="<?php echo $page; ?>" />            <input type="hidden" name="cwin"     value="<?php echo $cwin; ?>" />            <input type="hidden" name="is_good"  value="" />          <?php            //echo $comment_id;            $sql_comment = " select wr_id, wr_datetime from $write_table where wr_id = '$comment_id' ";            //echo $sql_comment;            $result_comment = sql_query($sql_comment);            while($row_comment = mysql_fetch_array($result_comment)) {              //echo $comment_id;            ?>            <input type="hidden" name="cid" value="<?php echo $comment_id; ?>" />            작성일 <input required style="width:140px;" name="cdate" maxlength="19" value="<?php echo $row_comment[wr_datetime]; ?>" />            <input type="submit" name="submit" value="수정" />            <?php            }          ?>          </form></td>        </tr>        <?php } ?>

<?phpinclude_once "_common.php";include_once "../../../dbconfig.php";if(!is_admin) {    echo 'Administrators only';    exit;}$dbconn = mysql_connect("$mysql_host","$mysql_user","$mysql_password") or die("데이터베이스 연결에 실패하였습니다.");mysql_select_db($mysql_db, $dbconn);$sql = "update $write_table set wr_datetime = '$_POST[cdate]' where wr_id = '$_POST[cid]' ";$result=mysql_query($sql,$dbconn);echo mysql_error();mysql_close($dbconn);  // MySQL에 접속종료// 그누보드 설치경로를 확인해서 오류나면 아래 링크를 수정하세요.echo " <script>alert('Has been modified.');  document.location.href='/bbs/board.php?bo_table={$_POST[bo_table]}&wr_id={$_POST[wr_id]}&page={$_POST[page]}&sca={$_POST[sca]}&sfl={$_POST[sfl]}&stx={$_POST[stx]}&spt={$_POST[spt]}&page={$_POST[page]}&cwin={$_POST[cwin]}&is_good={$_POST[is_good]}'; </script>";?> ​