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;