codice:
<style>
.hidden {
	visibility: hidden;
}
</style>
<script>
function HideOrShow(id){
	var	re = /(^|\s)(hidden)(\s|$)/,
		id = document.getElementById(id);
	if(re.test(id.className))
		id.className = id.className.replace(re, "$1");
	else
		id.className += " hidden";
};
function ShowMenu(div){
	div = "bar".concat(div);
	switch(this.iraiscoming223){
		case null:
		case undefined:
			HideOrShow(iraiscoming223 = div);
			break;
		case div:
			HideOrShow(div);
			iraiscoming223 = null;
			break;
		default:
			HideOrShow(iraiscoming223);
			HideOrShow(iraiscoming223 = div);
			break;
	};
	return false;
};
</script>
<div>
utente
<div class="hidden" id="barutente">sono il menu utente</div>
</div>
<div>
profilo
<div class="hidden" id="barprofilo">sono il menu profilo</div>
</div>