else if (MainFrame.getInstance().getViewType()==MainFrame.VIEW_WEEK)
else if (MainFrame.getInstance().getViewType()==MainFrame.VIEW_HALF_YEAR)
			public void actionPerformed(ActionEvent ae) {				if (MainFrame.getInstance().getViewType()==MainFrame.VIEW_WEEK)					periodChooser.setDate(new Date(periodChooser.getDate().getTime()+aWeek));				else if (MainFrame.getInstance().getViewType()==MainFrame.VIEW_WEEK)					periodChooser.setDate(new Date(periodChooser.getDate().getTime()+anHalfYear));					try {								model.fireShowTimetable(model.getTimetable()); //TODO modifier				} catch (InterruptedException e) {					System.err.println("calendar ++ fire exception : "+e.getMessage());					e.printStackTrace();				}			}