function display_pic(pic_number, pic_width, pic_height, title, pic_collection) {

        left_pos = (screen.availWidth - pic_width) / 2;

        msgWindow = window.open("includes/display_pic.php?pic="
            + pic_number + "&title=" + title + "&pic_collection=" + pic_collection,
            "displayWindow",
            "toolbar=no, scrollbar=no, height=" + pic_height +
            ", width=" + pic_width + ", top=30, left=" + left_pos)

        msgWindow.focus();
    }