dobre no, mierna modifikacia a je to:

<?php
if(IsSet($_GET['stranka'])) {
if ($_GET['stranka'] == "maxim") { include "./maxim.php"; }
elseif ($_GET['stranka'] == "kontakt") { include "./kontakt.php"; }
elseif ($_GET['stranka'] == "download") { include "./download.php"; }
else { include "./maxim.php"; }
}
else { include "./maxim.php"; }

?>