function ImgSize(img, max_width, max_height) {
    if (img.width > img.height) {
        if (img.width > max_width) {
            img.width = max_width;
        }
        if (img.height > max_height) {
            img.height = max_height;
        }
    }
    else {
        if (img.height > max_height) {
            img.height = max_height;

        }
        if (img.width > max_width) {
            img.width = max_width;
        }
    }
    var top = Math.round((max_height - img.height) / 2);

    img.style.margin = top + "px 0px 0px 0px";
}