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.getAttribute("rel") == "external nofollow"
	)
   anchor.target = "_blank";
}
}
window.onload = externalLinks;