for ($i=0; $row=sql_fetch_array($result); $i++) {

$evex = explode('/', $list[$i]['mi_ex']);
?>
<select id="<?php echo $list[$i][mi_id]?>_ex1" name="mi_ex1">
   <option value='' <? if($evex[0] == "") echo "selected"; ?>>택배사 선택</option>
   <option value='경동택배' <? if($evex[0] == "경동택배") echo "selected"; ?>>경동택배</option>
   <option value='대신택배' <? if($evex[0] == "대신택배") echo "selected"; ?>>대신택배</option>
   <option value='동부택배' <? if($evex[0] == "동부택배") echo "selected"; ?>>동부택배</option>
   </select> 운송장번호 <input id="<?php echo $list[$i][mi_id]?>_ex2" name="mi_ex2" type="input" value="<?php echo $evex[1]?>"><span OnClick="javascript:exok('<?php echo $list[$i][mi_id]?>')">등록</span>

<?php } //for?>

<script type="text/javascript"> 

function exok(mi_id) {

    var mi_ex = "";
 var ex1 = document.getElementById(mi_id + "_ex1");
 var ex2 = document.getElementById(mi_id + "_ex2");
 mi_ex = ex1.value + "/" + ex2.value;

     if(document.getElementById(mi_id + "_ex1").value == ""){
  alert('택배사를 선택하셔야합니다.');
 }else{
  
  if (!confirm("배송정보를 등록하시겠습니까?")) return;

    $.get("<?=$board_skin_url?>/ec/ev_ex.update.php?mi_id=" + mi_id + "&mi_ex=" + mi_ex, function (data) {
        data = data.split('|');
        alert(data[0]);
        if (data[1] == 'ok') location.reload();
       });
 }
}
</script>

ev_ex.update.php ---------------------------------------

$mi_ex <<이값이 안넘어오네요.......ㅡㅜ