sub new {
  @_ == 2 || die 'Usage: class->new($db)';
  my ($class_session, $db) = @_;  
  my $self = bless {
    db => $db,
    sessionLang => 'en',
    sessionID => '',
    sessionLiveTime => 900,
  }, $class_session;
  
  return $self;
}