this.collapse = function(){
 
   var collapse = document.getElementById("sitemap")
   if(collapse){
      
      this.listItem = function(li){
         if(li.getElementsByTagName("ul").length > 0){
            var ul = li.getElementsByTagName("ul")[0];
            ul.style.display = "none";
            var span = document.createElement("span");
            span.className = "collapsed";
            span.onclick = function(){
               ul.style.display = (ul.style.display == "none") ? "block" : "none";
               this.className = (ul.style.display == "none") ? "collapsed" : "expanded";
            };
            li.appendChild(span);
         };
      };
      
      var items = collapse.getElementsByTagName("li");
      for(var i=0;i<items.length;i++){
         listItem(items[i]);
      };
      
   }; 
};         
            

window.onload = collapse;