function em(subj, body) {
    domain = "grumpy-c-bear.org";

    str = 'mailto:feedback@' + domain;
    str += '?subject=Feedback';

    if (subj != null) {
        str += ': ' + subj;
    }
    if (body != null) {
        str += '&body=' + body;
    }

    window.location.replace(str);
}