function setExternalLinks() {
            if (!document.getElementsByTagName) {
                return null;
            }
            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.setAttribute("target", "_blank");
                }
            }
        }