var isNS = (navigator.appName == "Netscape" );
var DOM  = (document.getElementById) ? 1 : 0;
var isMacIE =  (navigator.userAgent.indexOf("Mac") > -1);
var layerRef = (isNS) ? "document" : "document.all";
var styleRef = (isNS) ? "" : ".style";
var isDynamic = true//( ((document.layers && document.layers['testmenu']) || (document.all && document.all['testmenu'])) && !isMacIE );
var activeMenu = 0;

var aggiustamento = (isNS) ? -7 : 0;
if (isMacIE && isNS) aggiustamento = aggiustamento +0;
if (isMacIE && isNS == false) aggiustamento =- 505 ;



function activateMenu(menuLayerRef,top,left) {


		if (isDynamic && activeMenu != menuLayerRef) {
		if (activeMenu) hideMenu("menu" + activeMenu); 
		menuID = "menu" + menuLayerRef;
		activeMenu = menuLayerRef;
		if (isNS) {
			document[menuID].top = top;
			delta=window.innerWidth/2;			
			document[menuID].left = delta + left + aggiustamento;
		} else {
			document.all[menuID].style.pixelTop = top;
			delta=document.body.clientWidth/2;				
			document.all[menuID].style.pixelLeft = delta + left + aggiustamento;
		}
		showMenu(menuID)
	}
}


function showMenu(layerID) {
	eval(layerRef + '["' + layerID + '"]' + styleRef + '.visibility = "visible"');
}

function hideMenu(layerID) {
eval(layerRef + '["' + layerID + '"]' + styleRef + '.visibility = "hidden"');
}

function turnOff() {
	if (activeMenu) {
		menuID = "menu" + activeMenu;
		hideMenu(menuID);
		activeMenu = 0;
	}	
}