SB fix to strengthen against bad URL requests

	if ( strtolower($order['dir']) != 'desc' and strtolower($order['dir']) != 'asc' )
		$order['dir'] = $default_order['dir'];
	$valid_sortby_values = array( 'm.id', 'm.title', 'm.datetime', 'm.start', 'm.end', 'p.id', 'p.name', 's.id', 's.name', 'ss.id', 'ss.name');
	if ( !in_array($order['by'], $valid_sortby_values) )
		$order['by'] = $default_order['by'];