function openWindow(w_name, w_url, w_width, w_height, w_resizable, w_scrollbars)
{
  if(!w_width) w_width = 640;
  if(!w_height) w_height = 480;
  if(!w_resizable) w_resizable = 'yes';
  if(!w_scrollbars) w_scrollbars = 'yes';
  return window.open(w_url, w_name, 'location=no,directories=no,status=no,menubar=no,width='+w_width+',height='+w_height+',scrollbars='+w_scrollbars+',resizable='+w_resizable);
}