function addExtLinkerEvents() {
var as = document.getElementsByTagName("a");
var extTrack = ["purpledragons.net"];
// replace mysite.com with your web site domain

for(var i=0; i<as.length; i++) {
        var tmp = as[i].getAttribute("onclick");
        // Track links off site � i.e. no GATC
        if (tmp != null && tmp.indexOf('_gaq') > -1) continue;
        for (var j=0; j<extTrack.length; j++) {
                if (as[i].href.indexOf(extTrack[j]) == -1) {
                        var splitResult = as[i].href.split("//");
                        as[i].setAttribute("onclick",((tmp != null) ? tmp : "") +
                          "_gaq.push(['_trackPageview','/ext/" + splitResult[1]+ "']);");
                        // the above must be on one line - from as[i]... to ");
                        break;
                }
        }
}
}