function setActive() {
  aObj = document.getElementById('topNav').getElementsByTagName('a');
  for(i=0;i<aObj.length;i++) { 
    if(document.location.href.indexOf(aObj[i].href)>=0) {
      aObj[i].className='onpage';
    }
  }
  aObj = document.getElementById('subNav').getElementsByTagName('a');
  for(i=0;i<aObj.length;i++) { 
    if(document.location.href.indexOf(aObj[i].href)>=0) {
      aObj[i].className='onpage';
    }
  }
}
window.onload = setActive;