ขอช่วยดูให้หน่อยนะค่ะ ทำไมมันบันทึกคะแนนลงฐานข้อมูลไม่ได้ งงค่ะ

<table width="98%" border="0" cellpadding="0" cellspacing="0"   align="center">
	      <tr>
	         <td bgcolor="#808080">
		      <table width="100%" align="center" width="90%" border="0" cellpadding="4" cellspacing="2" >
               <tr>
                 <td width="60%"  align="center" bgcolor="#999999"><font size=-1 face="verdana,arial" class="tblb"><b>งาน/เรื่องตามที่ได้รับมอบหมาย</b></font></td>
                 <td width="20%"  align="center" bgcolor="#999999"><font size=-1 face="verdana,arial" class="tblb"><b>ระดับค่านัยสำคัญ</b></font></td>
                 <td colspan="20%" align="center" bgcolor="#999999"><font size=-1 face="verdana,arial" class="tblb"><b>ปริมาณงาน (ชิ้น,เรื่อง,ครั้ง,ฯลฯ)</b></font></td>
                 </tr>
              
<?php
      $found_data = false;
      while($row_task = mysql_fetch_array($task_rs)){
         $found_data = true;
      //   $num_user = get_employee_kpi_map($row_employee_kpi [" kpiEmp_id"]);
?>
               <tr align="left" bgcolor="#FFFFFF">
			   <!-- <td><font face="verdana,arial" size=-1><?php echo $row_task["task_id"];?></font></td>-->
                 <td ><font face="verdana,arial" size=-1><?php echo $row_task["description"];?></font></td>
                 <td align="center" ><font face="verdana,arial" size=-1><?php echo $row_task["weight"];?></font></td>
                  <td  align="center" ><input  type="text"  size = "15" name="qulity" ></td>
                  </tr>
               	<?php
      }
?>
            </table>

<?php
   include("connect_db.php");
   include("inc_function.php");
   
   function add_score(){ 
      $sql = "INSERT INTO  quarter_score(task_id,qulity,project_id,user_id)
               VALUES ('$task_id', '$qulity','$project_id','$user_id')
      ";
      if(!$result = mysql_query($sql)){
         echo mysql_error();
         exit;
      }
   }
   
/*-------------------------------------- Main Program --------------------------------------------*/
     add_score(); 
   ?>         
<script language="javascript">
   alert("Save data Succes");
   window.location = "<?php echo $server_host;?>/list_emp_task.php?project_id=<?php echo $project_id;?>&user_id=<?php echo $user_id;?>&quarter_id=<?php echo $quarter_id;?>";
</script>


งงอ่ะก๊าฟฟฟ เป็นเพราะอะไร ช่วยหนูด้วยคร่า :'(