function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementById("content").getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.className == "external") {
   		//open external links in new window
		anchor.target = "_blank"
	}
 }
}
window.onload = externalLinks;