public void onWarningEmitted(String s) {
   if (_vp.isErrorsOn())
     JOptionPane.showMessageDialog(_vp, s, "VARNA Warning", JOptionPane.ERROR_MESSAGE);
 }
 /**
  * Open an error message dialog with the exception message
  *
  * @param e1 The <code>Exception</code>
  */
 public void errorDialog(Exception e1) {
   if (_vp.isErrorsOn())
     JOptionPane.showMessageDialog(_vp, e1.getMessage(), "VARNA Error", JOptionPane.ERROR_MESSAGE);
 }