function mailto_encrypt() {
  var at = '@';
  var dot = '.';
  var user = arguments[0];
  var domain1 = arguments[1];
  var domain2 = arguments[2];
  var numlinks = arguments[3];
  var subj = arguments[4];
  for  ( var i = 0 ; i < numlinks; i++ ) {
    var user = arguments[i];
    var fulladdress = document.createTextNode( user + at + domain1 + dot + domain2);
    if ( document.getElementById( user ) ) {
      var mailanchor = document.getElementById( user );
      var originalcontents = mailanchor.firstChild;
      mailanchor.setAttribute('href', "mailto:" + user + at + domain1 + dot + domain2 + '?subject=' + subj);
      mailanchor.replaceChild( fulladdress, originalcontents );
    }
  }
}