function decodeAddress() {
  if (document.getElementById) {
    var links = document.getElementsByTagName('a');
    
    for (var i = 0; i < links.length; i++) {
      var linkElem = links[i];
      
      if (linkElem.className == 'escape') {
        var user = linkElem.firstChild;
        var domain = linkElem.lastChild;
        
        user.nextSibling.firstChild.innerHTML = "&#64;";
        linkElem.href = "mailto:" + user.data + "@" + domain.data;
      }
    }
  }
}

Event.observe(window, 'load', decodeAddress, false);