function Reveal() {
  inText = "fghneg.oenql@tznvy.pbz";
  outText = "";
  inChars = "abcdefghijklmnopqrstuvwxyz@.";
  outChars = "nopqrstuvwxyzabcdefghijklm@.";
  for (n = 0; n < inText.length; n++) {
    i = inChars.indexOf(inText.charAt(n));
    outText += outChars.charAt(i);
  }

  outText = "Email address: <a href=\"mailto:Stuart Brady &lt;" + outText + "&gt;\">" + outText + "</a>";
  document.getElementById("address").innerHTML = outText;
  rb = document.getElementById("revbutton");
  rb.parentNode.removeChild(rb);
}

document.write("<p id=\"address\">To obtain my email address, click on the button below.</p>");
document.write("<input id=\"revbutton\" type=\"button\" name=\"reveal\" value=\"Reveal Address\" OnClick=\"Reveal()\" />");