public ArrayList<Course> getAllCoursesOn(Day day) {
		
		ArrayList<Course> crs = new ArrayList<Course>();
		
		for (Course c : COURSES) {
			for (int i = 0; i <= c.getTimeDayHolder().getDays().size() - 1; i++) {
				if (c.getTimeDayHolder().getDays().get(i).getString().equals(day.getString())) crs.add(c);
			}
		}
		
		return crs;
	}