function MM_Random() {
    var elem = document.getElementById("RandomImage");
    var elem_imgs = elem.getElementsByTagName("img");
    var randomnumber = (Math.floor(Math.random() * elem_imgs.length) + 1);
    for (var i = 0; i < elem_imgs.length; i++) {
        var elem_img = elem_imgs[i];
        if ((i + 1) == randomnumber) {
            elem_img.style.display = '';
        }
        else {
            elem_img.style.display = 'none';
        }
    }
}