function stripHash(url) {
  var i;
  if ( (i = url.indexOf("#")) != -1) {
    return url.substr(0, i);
  }
  else {
    return url;
  }
}

addLoadEvent(function() {
  var menu = $("sidebar");
  if (!menu) { return; }
  var links = menu.getElementsByTagName("a");
  for (var i=0; i<links.length; i++) {
    if ((links[i].href) == stripHash(location.href)) {
      if (links[i].parentNode.tagName.toLowerCase() == "li") {
        links[i].parentNode.className += " selected";
      }
    }
  }
});