function mailLink(element, user, site, tld, text) {
    var addr = user + '@' + site + '.' + tld;
    var str = '<a href=\"mail';
    str += 'to' + ':';
    str += addr;
    str += '\">';

    if (text == 'null') {
        str += user + '&#64;' + site + '.' + tld;
    } else {
        str += text;
    }

    str += '</a>';
    document.getElementById(element).innerHTML = str;
}