function ChangeLinksClass(){
        for (var i=0; i<document.links.length; i++){
          Link=document.links[i].hostname;
          IsExternal=(Link) && ((!location.hostname) || (Link.lastIndexOf(location.hostname) == -1));
          if (IsExternal){
            document.links[i].className = 'external';
          }
        }
      }