function addAdmin() {

        if (isset($_POST['add_user'])) {

            $firstname  =   mysql_real_escape_string($_POST['firstname']);
            $lastname   =   mysql_real_escape_string($_POST['lastname']);
            $email      =   mysql_real_escape_string($_POST['email']);
            $street     =   mysql_real_escape_string($_post['email']);
            $housenm    =   mysql_real_escape_string($_POST['housenmbr']);
            $city       =   mysql_real_escape_string($_POST['city']);
            $postalcode =   mysql_real_escape_string($_POST['postalcode']);
            $phone      =   htmlspecialchars($_POST['phone']);
            $username   =   mysql_real_escape_string($_POST['username']);
            $password   =   md5(trim(htmlspecialchars($_POST['password'])));
            $pass_check =   md5($_POST['pass_check']);

            if (!$password == $pass_check) {

                echo ('<p>Wachtwoorden zijn niet gelijk aan elkaar</p>');

            } else {

                if (!empty($firstname) && !empty($lastname) && !empty($email) && !empty($street) && !empty($housenm) && !empty($city)
                    && !empty($postalcode) && !empty($phone) && !empty($username) && !empty($password) && !empty($pass_check)) {

                    $result_add = mysql("SELECT username, email FROM `admins` WHERE username='$username' OR email='$email'");
                    if (mysql_num_rows($result) == 1) {

                        echo ('<p>Een gebruiker met de opgegeven gebruikersnaam en/of email bestaat al! Probeer nogmaals!</p>');

                    } else {

                        $add_sql = "INSERT INTO `admins` (firstname, lastname, email , street, housenmbr, city, postalcode, username, password, phone)
                                    VALUES ('$firstname', '$lastname', '$email', '$street', '$housenm', '$city', '$postalcode', '$username', '$password', '$phone')";
                        $add_res = mysql_query($add_sql) or die (mysql_error($add_sql));
                        if ($add_res) {

                            echo ('<p>Gebruiker successvol toegevoegd in de database!</p>');

                        } else {

                            echo ('<p>Er is iets fout gegaan. Neem contact met uw webmaster op!</p>');

                        }

                    }

                } else {

                    echo ('<p>Alle velden zijn verplicht</p>');

                }

            }

        }

    }