POST로 폼전송중인데, 데이터가 다 안들어가고있어요

<!------ test2_add.php 쿼리문 ------>

$addboard = $_POST['bo_table'];
$addid = $_POST['mb_id'];

 

$sql = " insert into {$g5['scrap2_table']} (bo_table,mb_id) VALUES ('$addboard','$addid')  ";
$row = sql_fetch($sql);

<!------ 폼 ------>

<form id="favoriteInfo" name="favoriteInfo" action="test2_add.php" method="post"> 
    <input type="hidden" id="bo_table" name="bo_table" value="<?php echo $bo_table ?>">
    <input type="hidden" id="mb_id" name="mb_id" value="<?php echo $mb_id ?>">
    <a href="javascript:;" onclick="favorite_submit()" class="btn btn-black">클릭하기</a>
</form>

 

 

<!------ 스크립 ------>

<script type="text/javascript">
function favorite_submit() {
var form = $("form[name=favoriteInfo").serialize();
$.ajax({
    url: g5_bbs_url+"/test2_add.php",
    type: "POST",
    cache: "false",
   data: form,
      success: function(data) {

          alert("성공");         
      }, 
      error: function() {
           alert("실패");
      }        
});
}
</script>