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";
     }

var anchors2 = document.getElementsByTagName("form");
 for (var s=0; s<anchors2.length; s++) {
   var anchor2 = anchors2[s];
   if (anchor2.getAttribute("id") == "external")
     anchor2.target = "_blank";
 }
}
window.onload = externalLinks;