include('inc/global.php');
include('inc/layout/header.php');
include('inc/layout/nav1.php');
?>
include('inc/content/googleads/skyscraperbegin.php');
?>
// redirect if 'id' parameter not set
if(!isset($_GET['id'])) {
  echo 'Invalid Information Systems topic.';
  echo '
';
  exit(0);
}
// redirect if file does not exist
// note: prefix on file name prevents user from displaying any arbitrary file
if (!@include('inc/content/infosys/is-'.$_GET['id'].'.php')) {
  echo 'Invalid Information Systems topic.';
  echo '
';
  exit(0);
}
?>
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