if (document.images) {
  image1on = new Image();
  image1on.src = "images/home_01_on.gif";
  image2on = new Image();
  image2on.src = "images/photos_01_on.gif";
  image3on = new Image();
  image3on.src = "images/social_scene_01_on.gif";
  image4on = new Image();
  image4on.src = "images/directions_01_on.gif";
  image5on = new Image();
  image5on.src = "images/join_01_on.gif";
  image6on = new Image();
  image6on.src = "images/contact_01_on.gif";
  image7on = new Image();
  image7on.src = "images/forms_01_on.gif";
   image8on = new Image();
  image8on.src = "images/schedules_01_on.gif";


  image1off = new Image();
  image1off.src = "images/home_01.gif";
  image2off = new Image();
  image2off.src = "images/photos_01.gif";
  image3off = new Image();
  image3off.src = "images/social_scene_01.gif";
  image4off = new Image();
  image4off.src = "images/directions_01.gif";
  image5off = new Image();
  image5off.src = "images/join_01.gif";
  image6off = new Image();
  image6off.src = "images/contact_01.gif";
    image7off = new Image();
  image7off.src = "images/forms_01.gif";
    image8off = new Image();
  image8off.src = "images/schedules_01.gif";
  

}

function turnOn(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "on.src");

  }
}

function turnOff(imageName) {
  if (document.images) {
    document[imageName].src = eval(imageName + "off.src");
  }
}