function newImage(arg) {
if (document.images) {
rslt = new Image();
rslt.src = arg;
return rslt;
}
}

function changeImages() {
if (document.images && (preloadFlag == true)) {
for (var i=0; i<changeImages.arguments.length; i+=2) {
document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
}
}
}

var preloadFlag = false;
function preloadImages() {
if (document.images) {
btn_top_over = newImage("./img/btn_top-over.gif");
btn_info_over = newImage("./img/btn_info-over.gif");
btn_print_over = newImage("./img/btn_print-over.gif");
btn_gallery_over = newImage("./img/btn_gallery-over.gif");
btn_zakka_over = newImage("./img/btn_zakka-over.gif");
btn_blog_over = newImage("./img/btn_blog-over.gif");
btn_link_over = newImage("./img/btn_link-over.gif");
btn_info_over017 = newImage("./img/btn_info-over-17.gif");
preloadFlag = true;
}
}