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;