private void sendComboBox (String name)
    {
        String temp = ("INVITE@" + name + "@" + roomId);
        temp += ( "@" + usernames.size() );
        for ( int j = usernames.size() - 1; j >= 0; j-- )
        {
            temp += ( "@" + usernames.get(j) );
        }
        client.sendMessage(temp);
    }