public static function getFromTo($group)
{
$DB = new Database();
$sql = "SELECT session_from, session_to FROM panelmembers WHERE session_group ='" . $group . "'";
$result = $DB->query($sql);
$row = $DB->fetch($result);
self::$from = $row['session_from'];
self::$to = $row['session_to'];
}
