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;

// show/hide
function toggleList(id) {
    if (document.getElementById) {
        var le = document.getElementById(id);
        le.style.display = le.style.display == "none" ? "block" : "none";
    }
}