ajax 반응이 없어서 질문드려 봅니다.

<input type=text id= 'wr_1' name='wr_1' value='<?=$write[wr_1]?>' onblur="date_o()"  size='22' maxlength='22' />      <a href="javascript:win_calendar('wr_subject', document.getElementById('wr_subject').value, '');"><img src='<?=$member_skin_path?>/img/calendar.gif' border="0" align="absmiddle" title='달력 - 날짜를 선택하세요' /> </a>      <input type=text id= 'wr_subject' name='wr_subject' style="border:none; text-align:center; color:#FFF;"  value='<?=$subject?>' onchang="date_o()" size='1' maxlength='8' readonly="readonly" />                      </td>                                            <td class=write_head> <input class='ed' style="width:50%; border:none; text-align:center;" name=wr_2 id="wr_2" itemname="주행전거리" onchange="chk_o();" value="<?=$write[wr_2]?>" readonly="readonly"></td>  <script type="text/javascript"> function date_o(){ wr_subject1 = document.getElementById('wr_subject').value; var d = new Date();document.getElementById('wr_1').value = wr_subject1 + ' ' + d.getHours() + ':' + d.getMinutes() + ':' + d.getSeconds();wr_subject = wr_subject1 + ' ' + d.getHours() + ':' + d.getMinutes() + ':' + d.getSeconds();       var subject = "";    var content = "";    $.ajax({        url: "<?=$board_skin_path?>/ajax_re.php",        type: "POST",        data: {            "subject": wr_subject.value,            "content": wr_subject.value        },        dataType: "json",        async: false,        cache: false,        success: function(data, textStatus) {            subject = data.subject;            content = data.content;        }    });       alert("제목에 금지단어('"+subject+"')가 포함되어있습니다");  document.getElementById('wr_2').value = subject;                } </script>

<?header("Content-Type: text/html; charset=$g4[charset]");$subject = strtolower($_POST['subject']);$content = strtolower(strip_tags($_POST['content']));//euc-kr 일 경우 $config['cf_filter'] 를 utf-8로 변환한다.if (strtolower($g4[charset]) == 'euc-kr') {    //$subject = convert_charset('utf-8', 'cp949', $subject);    //$content = convert_charset('utf-8', 'cp949', $content);    $config['cf_filter'] = convert_charset('cp949', 'utf-8', $config['cf_filter']);}    // 제목 필터링 (찾으면 중지)      $max_wr1 =sql_fetch("select max(wr_1) as m1 from g4_write_corporation_car_log");   $result =sql_query("select * from g4_write_corporation_car_log where (wr_1 between '$subject' and '$max_wr1[m1]') order by wr_subject asc");   for ($i=0; $wow=mysql_fetch_array($result); $i < 1) {       $sel = $wow[wr_3];  }              if (strtolower($g4[charset]) == 'euc-kr')             $subj = convert_charset('utf-8', 'cp949', $sel);//cp949 로 변환해서 반환        else             $subj = $sel;        break;       // 내용 필터링 (찾으면 중지)             if (strtolower($g4[charset]) == 'euc-kr')             $cont = convert_charset('utf-8', 'cp949', $sel);//cp949 로 변환해서 반환        else             $cont = $sel;        break;  die("{\"subject\":\"$subj\",\"content\":\"$cont\"}");?>