function setCookie (name, value, expires, path, domain, secure) {
document.cookie = name + "=" + escape(value) +
((expires) ? "; expires=" + expires : "") +
((path) ? "; path=" + path : "") +
((domain) ? "; domain=" + domain : "") +
((secure) ? "; secure" : "");
}

function turnMenu (flag) {
menu.style.visibility = flag ? 'hidden' : 'visible';
menu.style.display= flag ? 'none' : 'block';
setCookie('menuoff', (flag ? '1' : '0'));
}