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;