function treeWalker(obj)
{
   var li = obj.parentNode;
   while ((li) && (li.tagName != 'LI')) li = li.parentNode;
   li.className = (li.className == "act")?"":"act";
   return false;
}

window.onload = function(){
   var dom = document.getElementById("sparkle").childNodes;
   var i = 0;
   while(dom[i].tagName!="A"){
      i++;
   }
   var timer = window.setInterval(function(){ sparkle(dom[i]) },1000);
}

function sparkle(el){
   if(el.shown){
      el.style.backgroundColor = "#ff0000";
      el.style.color = "#ffffff";
      el.shown = false;
   }else{
      el.style.backgroundColor = "#ffffff";
      el.style.color = "#ff0000";
      el.shown = true;
   }

}