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;