function login($username = "",$password = "",$remember = "f")
    {
     global $db;
     global $link;
     $query_user = "SELECT * FROM `users` WHERE Gebruikersnaam = '$username' and Wachtwoord = MD5('$password') limit 1";
     $result_user = mysqli_query($link,$query_user);
     $rows = mysqli_num_rows($result_user);
     $user = mysqli_fetch_array($result_user);
     if ($rows  == 1)
     {
      if($remember == 't')
       {
        setcookie('id',$user['id'],time()+25200);
        setcookie('Gebruikersnaam',$user['Gebruikersnaam'],time()+25200);
        setcookie('Wachtwoord',$user['Wachtwoord'],time()+25200);
       }
         $_SESSION['id'] = $user['id'];
         $_SESSION['Gebruikersnaam'] = $user['Gebruikersnaam'];
         $_SESSION['Wachtwoord'] = $user['Wachtwoord'];
         $_SESSION['userSession'] = "t";
         $_SESSION['adminSession'] = $user['admin'];
         header("Location: memberpage.php");

       }
         return 0;
       }