// --- Javascript per il menu espandibile con massimo un livello aperto
var prev="null";

window.onload=function(){
if(document.getElementsByTagName && document.getElementById){
    document.getElementById("nav").className="jsenable";
    BuildList();
    }
}

function BuildList(){
   var hs=document.getElementById("nav").getElementsByTagName("h3");
   for(var i=0;i<hs.length;i++){
       hs[i].onclick=function(){
           if(this.parentNode.className!="show"){
               this.parentNode.className="show";
               if(prev && prev!=this.parentNode) prev.className="hide";
               prev=this.parentNode;
           }
           else this.parentNode.className="hide";
       }
    }
}