function showBookingPanel(from, to) {
  // Name the Window for targeting
  self.name = "popupOpener";
  
  var windowAttributes = "scrollbars=0, resizable, width=320, height=480, location=0, statusbar=no, toolbars=no";
  to = (to == null) ? null : to;
  
  openedWindow = (to == null) ? window.open("/popups/booking-panel/?from=" + from, "bookingPanel", windowAttributes) : window.open("/popups/booking-panel/?from=" + from + "&to=" + to, "bookingPanel", windowAttributes);
}