//画像をプリロード
img = new Array("css/image/nav_on.jpg","css/image/button_on.gif","css/image/select_guide.gif","css/image/externalLink.cur","css/image/main_loading.gif","css/image/side_loading.gif","lightbox/images/lightbox-ico-loading.gif","css/image/header.gif","css/image/nav.jpg","css/image/footer.gif");
bfImg = new Array();
for(i=0; i<img.length; i++) {
  bfImg[i] = new Image();
  bfImg[i].src = img[i];
}