function externalLinks() 
{ 
 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") == "external") { 
    anchor.target = "_blank"; 
    anchor.title = "opens in a new window"; 
    anchor.className = 'external'; 
} 
 if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "pdf") { 
    anchor.target = "_blank"; 
    anchor.title = "opens in a new window"; 
    anchor.className = 'pdf'; 
} 
 }
}
window.onload = externalLinks;