var agent=navigator.userAgent.toLowerCase();
var brw_ie	= ((agent.indexOf("msie") != -1) && (agent.indexOf("opera") == -1));
var openType = "block";
openType = brw_ie ? "block" : "table";

var openMenuId = "";
var oldString = "";
			//(1,'produtos','pt_PT')
function menu(id,stringImg,lingua){
	//alert("openMenuId ::: " + openMenuId );
	if (openMenuId == id){
		if (document.getElementById("menu" + id).style.display == openType){
			document.getElementById("menu" + id).style.display = "none";
			eval("document.clickMenu" + id).src = "http://www.piaggio.pt/img/" + lingua + "/nav/" + stringImg + ".gif"
		} else {
			document.getElementById("menu" + id).style.display = openType;
			eval("document.clickMenu" + id).src = "http://www.piaggio.pt/img/" + lingua + "/nav/" + stringImg + "_open.gif"
		}
	} else {
		if (openMenuId != "") {
			document.getElementById("menu" + openMenuId).style.display = "none";
			eval("document.clickMenu" + openMenuId).src = "http://www.piaggio.pt/img/" + lingua + "/nav/" + oldString + ".gif"
		}
		document.getElementById("menu" + id).style.display = openType;
		eval("document.clickMenu" + id).src = "http://www.piaggio.pt/img/" + lingua + "/nav/" + stringImg + "_open.gif"
	}
	openMenuId = id;
	oldString = stringImg;
}

<!--
var state = 'hidden';

function showhide(layer_ref) {

	if (state == 'visible') {
		state = 'hidden';
	} else {
		state = 'visible';
	}
	
	//IS IE 4 or 5 (or 6 beta)
	if (document.all) { eval( "document.all." + layer_ref + ".style.visibility = state"); }

	//IS NETSCAPE 4 or below
	if (document.layers) { 	document.layers[layer_ref].visibility = state; }
	
	if (document.getElementById && !document.all) {
		maxwell_smart = document.getElementById(layer_ref);
		maxwell_smart.style.visibility = state;
	}
}
//-->