public void startTimer(){
		Integer defaultTime = 120;
		Timer timer = new Timer();
		String timeString = timerText.getText();
		int time = 5;
		try {
			time = Integer.parseInt(timeString);
		} catch (NumberFormatException e){
			JOptionPane.showMessageDialog(this,
		    "Bitte eine vern���������nftige Zahl angeben!");
			timerText.setEditable(true);
			cRefresh.setSelected(false);
			timerText.setText(defaultTime.toString());
			return;
		}
		if(time < 5){
			JOptionPane.showMessageDialog(this,
		    "Bitte mehr als 5 sekunden angeben!");
			timerText.setEditable(true);
			cRefresh.setSelected(false);
			timerText.setText(defaultTime.toString());
			return;
		}
		
		time *= 1000;
		timer.schedule(new RefreshTask(this), time);
	}