สอบถามครับ เรื่องการเขียนโค๊ด update ค่าสถานะ โดยคลิ๊กจากปุ่มเท่านั้น

<? if($show['dur_status']=='1'){ echo "<font color=\"red\">ปิด</font>";} else { echo "<font color=\"green\">เปิด</font>";}?>
<a href="test.php?dur_id=<?=$show['dur_id'];?>"><img src="images/Switch.jpg" alt="" title="เปลี่ยนสถานะ"/></a>

<?

            include "config/connect.php";

            $dur_id = $_GET['dur_id'];

            $sql = "SELECT * FROM duration WHERE dur_id = '$dur_id'";
            $result = mysql_query($sql);
            $show = mysql_fetch_array($result);

            
            $dur_status   = $_GET['dur_status'];

            if($_GET['dur_status'] == '0'){
                $sqlOpen = "UPDATE duration SET dur_status = '1' WHERE dur_id = '$dur_id'";
                $resultOpen = mysql_query($sqlOpen);
                header("location: addDurationAdmin.php");
                exit();
                }else{
                if($_GET['dur_status'] == '1'){
                $sqlClose = "UPDATE duration SET dur_status = '0' WHERE dur_id = '$dur_id'";
                $resultClose = mysql_query($sqlClose);
                header("location: addDurationAdmin.php");
                exit();
                    }
                }
        ?>