public void vote(Client client, String answer) {
		synchronized (votes) {
			if (!votes.containsKey(client.getName())
					&& answers.contains(answer)) {
				if (closed) {
					String popup = Popup
							.create("Umfrage",
									String.format("Umfrage #%s - Problem", id),
									"Du hast dir f�r die Beantwortung der Umfrage zu lange Zeit gelassen.",
									400, 300);
					client.send(popup);
				} else {
					votes.put(client.getName(), answer);
				}
			}
		}
	}