หา error ไม่เจอค่ะ กรุณาช่วยดูให้หน่อยค่ะ(You have an error in your SQL syntax;)

<?
$name = $_POST['name'];
$sname = $_POST['sname'];
$day = $_POST['date'];
$month = $_POST['month'];
$year = $_POST['year'];

$sex = $_POST['sex'];
$idcard = $_POST['idcard'];
$school = $_POST['school'];

$amphur = $_POST['amphur'];
$section = $_POST['section'];
$permiss = $_POST['permiss'];


$phone = $_POST['phone'];
$education = $_POST['education'];
$job= $_POST['job'];
$position = $_POST['position'];
$salary = $_POST['salary'];

$user_name = $_POST['user_name'];
$pwd_name1 = $_POST['pwd_name1'];
$pwd_name2 = $_POST['pwd_name2'];
$email = $_POST['email'];
$Submit = $_POST['Submit'];
$ok = $_POST['ok'];
$date_reg=date("Y-m-d");



if((isset($ok)) and ($ok!="ok_pass")) {
echo "<meta http-equiv='refresh' content='0; url=addmember.php'>" ; exit();
}

$sql="select * from co_member where username='$user_name' ";
$result=mysql_db_query($dbname,$sql);
$num=mysql_num_rows($result);

if ($num>0) {echo"ชื่อนี้มีอยู่ในระบบแล้ว"; exit();
echo" <a href='addmember.php'>[กลับสู่หน้าเดิม]</a><br><br>"; exit();
}
$sql = "select * from co_member order by id desc" ;
$result = mysql_query($sql) ;
$num_result  = mysql_num_rows($result) ;
$dbarr = mysql_fetch_row($result) ;
$member_db = $dbarr[0]+1 ; // นำค่า id มาเพิ่มให้กับค่ารหัสสมาชิกครั้งละ1

if($member_db>=100) {
$member_in = "0$member_db" ;
}
else {
if($member_db >=10) {
$member_in = "00$member_db" ;
}
else {
$member_in = "000$member_db" ;
}
}

$member_id = $membercode.$member_in;

$sql="insert into co_member 
values('','$member_id','$user_name','$pwd_name1','$name','$sname','$sex','$day','$month','$year','$email','$education','$job','$position', '$salary','$school', '$section', '$amphur','$phone','$idcard,'','$permiss','','')";
$result=mysql_db_query ($dbname,$sql);
if ($result){
echo "<center><font size=\"3\" face='MS Sans Serif'><b>บันทึกข้อมูลเรียบร้อบ</b></font></center>";
echo "<a href ='addmember.php'><h1>[กรุณารอสักครู่ กำลังกลับสู่หน้าเดิม]</h></a>"; 
echo "<meta http-equiv='refresh' content='2; url=addmember.php'>" ;


} else {
echo"ไม่สามารถบันทึกข้อมูลได้";
echo" <a href='addmember.php'>[กลับสู่หน้าเดิม]</a><br><br>";
echo mysql_error();
}
mysql_close();

?>