function attachExternals() {
  if (document.getElementsByTagName('a')) {
    as = document.getElementsByTagName('a');
    for (var i=0; i<as.length; i++) {
      if (as[i].className.indexOf('external') >= 0) {
        as[i].target = '_blank';
      }
    }
  }
}

function trackTime() {
  theTime = theTime + 15;
  if (theTime > 150) {
    clearInterval(timeTracking);
  } else {
    pageTracker._trackPageview('/_timing/' + theTime + '/');
  }
}