function write_contact (bw, alt) {
    var prefix = bw.reverse().join('');
    var suffix = "software-path.com";
    var address = prefix + "@" + suffix;
    var vis_addr = alt ? alt : address;

    document.write('<a href="mai');
    document.write('lto' + ':' + address + '">' + vis_addr + '</a>');
}