//Define image file names for menu images.

if (document.images) {
  /////////////////////////////////////////////////
  // main headings
  /////////////////////////////////////////////////
  var aboutOff = new Image();
  aboutOff.src = "../images/NAV_about_OFF.gif";
  var aboutOn = new Image();
  aboutOn.src = "../images/NAV_about_ON.gif";
  var bookOff = new Image();
  bookOff.src = "../images/NAV_book_OFF.gif";
  var bookOn = new Image();
  bookOn.src = "../images/NAV_book_ON.gif";
  var contactOff = new Image();
  contactOff.src = "../images/NAV_contact_OFF.gif";
  var contactOn = new Image();
  contactOn.src = "../images//NAV_contact_ON.gif";
  var tripsOff = new Image();
  tripsOff.src = "../images/NAV_trips_OFF.gif";
  var tripsOn = new Image();
  tripsOn.src = "../images/NAV_trips_ON.gif";
  var homeOff = new Image();
  homeOff.src = "../images/NAV_home_OFF.gif";
  var homeOn = new Image();
  homeOn.src = "../images/NAV_home_ON.gif";
  var trailOff = new Image();
  trailOff.src = "../images/NAV_trail_OFF.gif";
  var trailOn = new Image();
  trailOn.src = "../images/NAV_trail_ON.gif";
  var photoOff = new Image();
  photoOff.src = "../images/NAV_photo_OFF.gif";
  var photoOn = new Image();
  photoOn.src = "../images/NAV_photo_ON.gif";
  var faqOff = new Image();
  faqOff.src = "../images/NAV_faq_OFF.gif";
  var faqOn = new Image();
  faqOn.src = "../images/NAV_faq_ON.gif";
}