var timeout=150;
var counter=-1;
function countdown() {
	counter=setTimeout("nascondiTutto()",timeout);
	}
function mostra(lay) {
	if(counter!=-1) clearTimeout(counter);
	nascondiTutto();
	document.getElementById(lay).style.visibility='visible';
	}
function nascondiTutto() {
	for(i=0;document.getElementById('sub'+i);i++) {
		document.getElementById('sub'+i).style.visibility='hidden';
		}
	}

function seleziona(lay) {
	if(!document.all) ref=document.getElementById(lay);
	else ref=document.all(lay);
	return ref;
	}
function showLay(lay) {
	ref=seleziona(lay);
	ref.style.display=='none' ? ref.style.display='block' : ref.style.display='none';
	}