function list_files($try, $dir){
    $list = array();
    foreach(scandir($dir) as $c){
      $c = str_replace('..', '', $c);
      if(strchr($c, '.inc.php') == '.inc.php'){
	$list[] = str_replace('.inc.php', '', $c);
      }
    }
    if(in_array($try, $list)){
      $r = $try;
    }else{
      $r = 'index';
    }
    return $r;
  }