//
function runCode(obj) {
    var code = obj.value;
    var newwin = window.open("", "", "");
    newwin.opener = null;
    newwin.document.write(code);
    newwin.document.close();
}

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;