private void jLabel23MouseClicked(java.awt.event.MouseEvent evt) {//GEN-FIRST:event_jLabel23MouseClicked
       String command="cmd.exe /c start ";
       String site=command+wiki3;
             
       try {
               Process pc = Runtime.getRuntime().exec(site);
              } catch (IOException ex) {JOptionPane.showMessageDialog(this, "Ο σύνδεσμος δε λειτουργεί!");}
    }