public void actionPerformed(ActionEvent e)
        {
            String action = e.getActionCommand();

            try {
                if (action.equals(Constantes.BACK)) {
                    if (!history.isEmpty())
                        editor.setPage(history.removeFirst());
                }
                if (action.equals(Constantes.HOME))
                    editor.setPage(Main.class
                            .getResource("help/whatsnew.html"));
            } catch (IOException exp) {
            }
        }