var totalLayersInLoop=7;
	var layerNumShowing=1;
	var layerRef;
	var styleSwitch;

	function init(){

		if (navigator.appName == "Netscape") {
			layerStyleRef="layer.";
			layerRef="document.layers";
			styleSwitch="";
			}else{
			layerStyleRef="layer.style.";
			layerRef="document.all";
			styleSwitch=".style";
			}	}


	function showLayer(layerName){
 		eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="visible"'); 	
		} 	


	function hideLayer(layerName){
 		eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"'); 	
		} 

	function popup(str) {
		searchWin = window.open(str,'esempio','scrollbars=yes,resizable=yes,width=650,height=500,status=no,location=no,toolbar=no');
	}

	//popup2 apre la finestra a schermo intero
	function popup2(str) {
		searchWin = window.open(str,'','scrollbars=yes,resizable=yes,status=no,location=no,toolbar=no');
	}