function preload(images) {
    if (typeof document.body == "undefined") return;
    try {
        var div = document.createElement("div");
        var s = div.style;
        s.position = "absolute";
        s.top = s.left = 0;
        s.visibility = "hidden";
        document.body.appendChild(div);
        div.innerHTML = "<img src=\"" + images.join("\" /><img src=\"") + "\" />";
    } catch(e) {
        // Error. Do nothing.
    }
}