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

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

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