// JavaScript Document

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")) {
      if (anchor.getAttribute("rel")) {
        var rels = anchor.getAttribute("rel").split(" ");
        for (var j=0; j<rels.length; j++) {
          if (rels[j] == "external") anchor.target = "_blank";
        }
      }
    }
  }
}
Event.observe(window, 'load', externalLinks, false);