private void openMenuItemActionPerformed(java.awt.event.ActionEvent evt)
{
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(currentDir);
ExtensionFileFilter pdfFilter = new ExtensionFileFilter(new String[] {"PDF"}, "PDF Files");
chooser.setFileFilter(pdfFilter);
int result = chooser.showOpenDialog(PDFReader.this);
if (result == JFileChooser.APPROVE_OPTION)
{
String name = chooser.getSelectedFile().getPath();