function externalLinks() {
  for(var i = 0; i < document.links.length; i++) {
     if(document.links[i].hostname.length < 1) 
     { continue; }
     if(document.links[i].target.length > 0)
     { continue; }
     var h = document.links[i].hostname.toLowerCase();
     if (h != location.hostname) {
     	// new win
      document.links[i].target = '_blank';
      document.links[i].onclick = function() {
      	// alert("URL: "+this.href);
      	http.open("GET", "/ajax.outlink_click.php?url="+escape(this.href));
      	http.send(null);
      }
    }
  }
}

window.onload = externalLinks;