Login script - SGG

<?php
    if(isset($_POST['login']))
    {
        include 'dbh.cfg.php';
        $sUser = $_POST['name'];
        $sPass = $_POST['pass'];

        if(empty($sUser) || empty($sPass))
        {
            header("location: ../index.php?error=empty");
            exit();
        }
        else
        {
            $sql = "SELECT * FROM `accounts` WHERE `Username`=?;";
            $stmt = mysqli_stmt_init($conn);

            if(!mysqli_stmt_prepare($stmt, $sql))
            {
                header("location: ../index.php?error=sqlerror");
            }
            else
            {
                mysqli_stmt_bind_param($stmt, "s", $sUser);
                mysqli_stmt_execute($stmt);
                $result = mysqli_stmt_get_result($stmt);

                if($row = mysqli_fetch_assoc($result))
                {
                    $fPass = $sPass.$row['Salt'];
                    $sKey = strtoupper(hash("whirlpool", $fPass));

                    if($row['AdminLevel'] > 0)
                    {
                        if($sKey != $row['Key'])
                        {
                            header("location: ../index.php?wpass");
                            exit();
                        }
                        else
                        {
                            session_start();
                            $_SESSION['sId'] = $row['id'];
                            $_SESSION['sAdminLevel'] = $row['AdminLevel'];
                            $_SESSION['sUser'] = $row['Username'];
                            $_SESSION['sAdmin'] = $row['AdminName'];

                            header("location: ../admin.php?success");
                        }
                    }
                    else
                    {
                        header("location: ../index.php?error=admin");
                        exit();
                    }
                }
                else
                {
                    header("location: ../index.php?wronguser");
                    exit();
                }
            }

        }
    }
    else
    {
        header("location: ../index.php?error");
        exit();
    }