//javascript per 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";
}
}
}