function generate_address(username, domain, extension, display) {
  var atsign = "@";
  var addr = username + atsign + domain + "." + extension;
  document.write("<" + "a" + " " + "href=" + "mail" + "to:" + addr + ">"
    + display + "<\/a>");
}

function generate_self_address(username, domain, extension) {
  var atsign = "&#64;";
  var addr = username + atsign + domain + "." + extension;
  document.write("<" + "a" + " " + "href=" + "mail" + "to:" + addr + ">"
    + addr + "<\/a>");
}