IF ($_GET["cat"])
$cat = $_GET["cat"] ;
switch ($cat) {
case 1:
include('3unterricht/gesang.php');
break;
case 2:
include('3unterricht/klavier.php');
break;
case 3:
include('3unterricht/musiktheorie.php');
break;
default:
include('3unterricht/gesang.php');
}
?>