function doPopups() { 
 if (!document.getElementsByTagName) return false; 
 var links = document.getElementsByTagName("a"); 
 for (var i=0; i < links.length; i++) { 
   if (links[i].className.match("external-link-new-window")) { 
     links[i].onclick = function() { 
       window.open(this.href); 
       return false; 
     } 
   } 
 } 
} 
window.onload = doPopups;