If else statement error confused

Hello guys I was confused using the if else statement I know it is the basic in conditioning also other languages. Don't know what to do here, I would like that it has an if condition(check) then also inside I want that it has an else if but my problem is I have to else statement which is wrong cause I know that else statement will be use at the end of a condition

Here's my code:

if (mysql_num_rows($result1)<=1){
            $_SESSION['idno']=$row['idno'];

                $sql_c = "SELECT * FROM student WHERE idno = '$idno' AND password = '$password'";
                $result2 = mysql_query($sql_c) or die(mysql_error());
                $faunc = mysql_fetch_assoc($result2);
                        $_SESSION['SESS_COURSE'] = $faunc['progid'];
                        $_SESSION['SESS_MEMBER_ID'] = $idno;
                        header('location: plsvote.php');    }

                    else if ($row['status'] == 'lock'){
            header('location: last.php');}


            else {
                header('location: notification.php');
                exit();
            }   
    else{
    echo "<script type='text/javascript'>\n";
    echo "alert('Username or Password incorrect!, Please try again.');\n";
    echo "window.location = 'index.php';";
    echo "</script>";
exit();
}

Please help me