JButton b = (JButton) c; b.setRolloverEnabled(true);
AbstractButton b = (AbstractButton) c; b.setRolloverEnabled(false);   borders.put(b, b.getBorder());
  protected void setBorderToRollover(Component c)  {    if (c instanceof JButton)      {	JButton b = (JButton) c;	b.setRolloverEnabled(true);	b.setBorder(rolloverBorder);      }  }