public void addListenerHistButton(final JButton histButton){
        histButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                try {
                    URL urlButton = new URL(histButton.getText());
                    System.out.println("histButton: "+histButton.getText()+" actual: "+actual.toString());
                    if(!urlButton.toString().equals(actual.toString()) && actual!=null){
                        guardarHist(urlButton);
                        url_back.push(actual);
                    }
                    pageGo(urlButton);
                    refreshButtons();
                } catch (MalformedURLException ex) {
                    Logger.getLogger(Pantalla.class.getName()).log(Level.SEVERE, null, ex);
                }
                try {

                } catch (Exception ex) {
                    Logger.getLogger(Pantalla.class.getName()).log(Level.SEVERE, null, ex);
                }
        }
        });
    }