if (document.getElementById ) {
  var m  = document.getElementById("sectionNav");
  var ml = m.getElementsByTagName("a");
  var nl = ml.length;

  for(var i = 0; i <= nl-1; i++) {
    if ( location.pathname == '/'+ml[i].pathname ) { ml[i].style.borderBottomColor = "#FC3"; }
  }
}