function addsel() {
  var a = document.getElementsByTagName("A");
  url = window.location.href;
  url = url.split("#")[0];
  url = url.split("?")[0];
  for (var i=0; i<a.length; i++) {
    if(a[i].href == url) {
      a[i].className += ' sel';
    }
  }
}
window.onload = addsel;