function doem(box, dom, sub, lab) {
    var user = box;
    var domain = dom;
    var subject = sub;
    var label = lab;
    if (lab == '') label = user + '@' + domain;
    var sysmt = 'mail' + 'to';
    document.write('<a href="' + sysmt + ':' + user + '@' + domain + '?' + 'subject=' + subject + '"' + '>' + label + '</a>');
}