if (document.images) {
   image1on = new Image();
   image1on.src = "/images/n_home2.gif";
   image1off = new Image();
   image1off.src = "/images/n_home1.gif";
   image2on = new Image();
   image2on.src = "/images/n_firm2.gif";
   image2off = new Image();
   image2off.src = "/images/n_firm1.gif";
   image3on = new Image();
   image3on.src = "/images/n_meet2.gif";
   image3off = new Image();
   image3off.src = "/images/n_meet1.gif";
   image4on = new Image();
   image4on.src = "/images/n_areas2.gif";
   image4off = new Image();
   image4off.src = "/images/n_areas1.gif";
   image5on = new Image();
   image5on.src = "/images/n_links2.gif";
   image5off = new Image();
   image5off.src = "/images/n_links1.gif";
   image6on = new Image();
   image6on.src = "/images/n_contact2.gif";
   image6off = new Image();
   image6off.src = "/images/n_contact1.gif";
}

function changeImages() {
   if (document.images) {
      for (var i=0; i<changeImages.arguments.length; i+=2) {
         document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
      }
   }
}