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