function convertMailAddress() {
  var emailElements;
  if (document.getElementsByClassName)
    emailElements = document.getElementsByClassName("email");
  else
    emailElements = document.getElementsByClassNameForOldies("email");
  var elementContent, replaceContent;
  for (var i=0; i<emailElements.length; i++) {
    elementContent = emailElements[i].innerHTML;
    replaceContent = elementContent.replace(" [at] ", "&#64;");
    emailElements[i].innerHTML =
      "<a href=\"mailto:" + replaceContent + "\">" + replaceContent + "</a>";
  }
}
document.getElementsByClassNameForOldies = function(cl) {
  var retnode = [];
  var myclass = new RegExp('\\b'+cl+'\\b');
  var elem = this.getElementsByTagName('*');
  for (var i = 0; i < elem.length; i++) {
    var classes = elem[i].className;
    if (myclass.test(classes)) retnode.push(elem[i]);
  }
  return retnode;
};
window.onload = convertMailAddress;