private void forwardButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_forwardButtonActionPerformed
    URL currentUrl = displayEditorPane.getPage();
    int pageIndex = pageList.indexOf(currentUrl.toString());
    try {
        showPage(new URL((String) pageList.get(pageIndex + 1)), false);
    } catch (Exception e) {
    }
}