window.onload = function(){
if(document.getElementById('menu')){
  ulList = document.getElementById('menu').getElementsByTagName('UL')[0];
  liPole = ulList.getElementsByTagName('LI');
  
  for(var i=0 ; i <= liPole.length-1 ; i++){
    if(liPole[i].className == 'active'){ 
      if(liPole[i+1]){
        liPole[i+1].className = 'sibling';   
      }
    }
  }
}
}