function image_resize() {
    $(".largepreview").each(function () {
            var maxWidth = 475;
            var maxHeight = 1000;
            var ratio = 0;
            var width = $(this).width();
            var height = $(this).height();
            if (width > maxWidth) {
                ratio = (maxWidth / width);
                $(this).attr({
                        width : maxWidth,
                        height : (height * ratio),
                    });
                height = (height * ratio);
                width = (width * ratio);
                if (height > maxHeight) {
                    ratio = (maxHeight / height);
                    $(this).attr({
                            height : maxHeight,
                            width : (width * ratio),
                        });

                }
            }
        });
}