function activePage() {
  var myUrl=String(window.self.location).split("/");
  var myFile=myUrl.pop()
 if (!document.getElementsByTagName) return;
 if(myFile==''){
  document.getElementById('left').getElementsByTagName('li')[0].className='buttonGreen';
 }
 else{
   var items = document.getElementById('left').getElementsByTagName('li');
   for (var i=0; i<items.length; i++) {
     var item = items[i];
     if (item.innerHTML.match(myFile))
       item.className='buttonGreen';
   }
   var items = document.getElementById('right').getElementsByTagName('li');
   for (var i=0; i<items.length; i++) {
     var item = items[i];
     if (item.innerHTML.match(myFile))
       item.className='buttonGreen';
   }
 }
}