var preLoadImagesURL = new Array(
"/img_1/tab_colors/h1.gif",
"/img_1/tab_colors/h2.gif",
"/img_1/tab_colors/h3.gif",
"/img_1/tab_colors/h4.gif",
"/img_1/tab_colors/h5.gif");

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