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") == "ext")){
			anchor.target = "_blank";
		}
	}
}
window.onload = externalLinks;