if (document.images) {

img = new Image();
img.src = "images/key_visual_bottom_2.jpg";

img1 = new Image();
img1.src = "images/key_visual_bottom_2_1.jpg";

img2 = new Image();
img2.src = "images/key_visual_bottom_2_2.jpg";

img3 = new Image();
img3.src = "images/key_visual_bottom_2_3.jpg";

img4 = new Image();
img4.src = "images/key_visual_bottom_2_4.jpg";

img5 = new Image();
img5.src = "images/key_visual_bottom_2_5.jpg";

img6 = new Image();
img6.src = "images/key_visual_bottom_2_6.jpg";



}

function imageOn(imageName){
  document["key_bottom"].src = eval(imageName+".src");
}

function imageOff(imageName){
  document["key_bottom"].src = eval(imageName+".src");
}