function Avvio(){
if(document.getElementsByTagName && document.getElementById){
    document.getElementById("MENU").className="JSENABLE";
    BuildList();
    }
}

function BuildList(){
var hs=document.getElementById("MENU").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";
        }
    }
}