var giorni_validita = 30;

function switch_status(objname) {
	var obj = document.getElementById(objname);
	if (obj.style.display == 'inline')
		hide_and_remember(obj);
	else
		show_and_remember(obj);
}

function hide_and_remember(obj) {
	hide(obj);
	createCookie(obj.id,"hide",giorni_validita);
}

function hide(obj) {
	obj.style.display = "none";
}

function show_and_remember(obj) {
	show(obj);
	createCookie(obj.id,"show",giorni_validita);
}

function show(obj) {
	obj.style.display = "inline";
}

function do_onload() {
	showhide_onload('menubar_about');
	showhide_onload('menubar_content');
}

function showhide_onload(objname) {
	var obj = document.getElementById(objname);
	var cookie=readCookie(objname);
	if (cookie=="show")
		show_and_remember(obj);
	if (cookie=="hide")
		hide_and_remember(obj);
}

/*
 * Funzioni per cookies da http://www.quirksmode.org/js/cookies.html
 */

function createCookie(name,value,days)
{
	if (days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++)
	{
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name)
{
	createCookie(name,"",-1);
}