//Per categorie laterali
function showHideCat(o){
	var list = o.parentNode.getElementsByTagName("ul");
	o.className = o.className=="open"?"folder":"open";
	for(var i=0;i<list.length;i++)
		if(o.parentNode==list[i].parentNode)
			list[i].style.display = list[i].style.display=="none"?"block":"none";
	return false;
}