// JavaScript Document
var preLoadImagesURL = new Array(
"http://www.cotetsu.org/img/bg_menu.gif",
"http://www.cotetsu.org/img/bg_menu_on.gif");

var preLoadImages = new Array(preLoadImagesURL.length);
for(i = 0; i < preLoadImages; i++){
    preLoadImages[i] = new Image();
    preLoadImages[i].src = preLoadImagesURL[i];
}