// target=_blank����

 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";  
 }  
 }  
 window.onload=externalLinks;