insert ไม่ได้ช่วยดูหน่อยครับ แอบมึนเบา...เบา ช่วยแก้ไขให้หน่อยนะครับ

<?
include('ConnectDB.php');
include('student_add.php');
$userid = $_POST["txtuser"];
$firstname = $_POST["txtFname"];
$lastname = $_POST["txtLname"];
$address = $_POST["address"];
$telephone = $_POST["telephone"];
$username = $_POST["txtUsername"];
$password = $_POST["txtPassword"];
$year = $_POST["year"];
$gpa = $_POST["gpa"];
$behavior = $_POST["behavior"];
//$enPass = md5($password);
		
		$sql=	"	INSERT INTO user ( user_id, firstname, lastname, address, telephone, username, password, year, status)
					VALUES ( '$userid', '$firstname', '$lastname', '$address', '$telephone', '$username', '$password', '$year', 'F')
				";
		$query = mysql_db_query($dbname, $sql) or die("Can't Query"); <-----ติดตรงนี้เลยครับ
	
		if($query)
		{
			echo "	<script language='javascript'>
					alert('Success');
					window.location='student_add.php';
					</script>
				 ";
		}else
		{
			echo "	<script language='javascript'>
					alert('Fail');
					window.location='student_add.php';
					</script>
				 ";
		}
mysql_close();
?>