function replaceMailAddresses() {
  var elements=document.getElementsByTagName("a");

  for (i=0;i<elements.length;i++) 
  {
    var elem=elements[i];
    var href=elem.getAttribute("href");

    if (href && href.indexOf("()")!=-1)
    {
      var data=href.replace("()","@");
      elem.setAttribute("href",data);
      var ch = elem.firstChild;
      if (ch) {
        var data2=ch.nodeValue;
        if (data2) {
          data2=data2.replace("()","@");
          ch.nodeValue=data2;
        }
      }
    }
  }
}