function openWin(url, opt) {
  window.open(url,'',opt);
}

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;