private void deleteContact() {
		if (ek != null) {
			int response = JOptionPane.showConfirmDialog(this,
					"M\u00F6chten Sie den Kontakt wirklich l\u00F6schen?");
			if (response == JOptionPane.YES_OPTION) {
				ekd.delete(ek);
				displayFirst();
			}
		}
	}