function externalLinks() {
   var host_Name = location.host;
   var host_Check;
   var link_Href;

   for(var i=0; i < document.links.length; ++i)
   {
       link_Href = document.links[i].host;
       host_Check = link_Href.indexOf(host_Name,0);

       if(host_Check == -1){
           document.links[i].innerHTML = document.links[i].innerHTML + "<img src=\"skin/orangebox/external_link.gif\" height=\"11px\" width=\"11px\" alt=\"\" class=\"external_link\">";

       }

   }
   
if (!document.getElementsByTagName) return;  
var anchors = document.getElementsByTagName("a");  
for (var i=0; i<anchors.length; i++) {  
var anchor = anchors[i];  
if (anchor.getAttribute("href") &&  
anchor.getAttribute("rel") == "nofollow")  
anchor.target = "_blank";  
}  
}  
window.onload=externalLinks;