// imposta il cookie sNome = sValore
// per la durata di iGiorni es: setCookie('Prova','123',1);
function setCookie(sNome, sValore, iGiorni) {
  var dtOggi = new Date()
  var dtExpires = new Date()
  dtExpires.setTime
    (dtOggi.getTime() + 24 * iGiorni * 3600000)
  document.cookie = sNome + "=" + escape(sValore) +
    "; expires=" + dtExpires.toGMTString();
}

// restituisce il valore del cookie sNome es: getCookie('Prova')
function getCookie(sNome) {
  // genera un array di coppie "Nome = Valore"
  // NOTA: i cookies sono separati da ';'
  var asCookies = document.cookie.split("; ");
  // ciclo su tutti i cookies
  for (var iCnt = 0; iCnt < asCookies.length; iCnt++)
  {
    // leggo singolo cookie "Nome = Valore"
    var asCookie = asCookies[iCnt].split("=");
    if (sNome == asCookie[0]) { 
      return (unescape(asCookie[1]));
    }
  }

  // SE non esiste il cookie richiesto 
  return("");
}

// rimuove un cookie es: delCookie('Prova')
function delCookie(sNome) {
  setCookie(sNome, "");
}
// tutti i cookies es: document.cookie.split(';').join('\n')

function montre(id) {
	var d = document.getElementById(id);
		if (document.getElementById('smenu_a')) {document.getElementById('smenu_a').style.display='none';}
		if (document.getElementById('smenu_b')) {document.getElementById('smenu_b').style.display='none';}
		if (document.getElementById('smenu_c')) {document.getElementById('smenu_c').style.display='none';}
		if (document.getElementById('smenu_d')) {document.getElementById('smenu_d').style.display='none';}
		if (document.getElementById('smenu_e')) {document.getElementById('smenu_e').style.display='none';}
		if (document.getElementById('smenu_f')) {document.getElementById('smenu_f').style.display='none';}
		if (document.getElementById('smenu_g')) {document.getElementById('smenu_g').style.display='none';}
		if (document.getElementById('smenu_h')) {document.getElementById('smenu_h').style.display='none';}
		if (document.getElementById('smenu_i')) {document.getElementById('smenu_i').style.display='none';}
		if (document.getElementById('smenu_j')) {document.getElementById('smenu_j').style.display='none';}
		if (document.getElementById('smenu_k')) {document.getElementById('smenu_k').style.display='none';}
		if (document.getElementById('smenu_l')) {document.getElementById('smenu_l').style.display='none';}
		if (document.getElementById('smenu_m')) {document.getElementById('smenu_m').style.display='none';}
		if (document.getElementById('smenu_n')) {document.getElementById('smenu_n').style.display='none';}
		if (document.getElementById('smenu_o')) {document.getElementById('smenu_o').style.display='none';}
		if (document.getElementById('smenu_p')) {document.getElementById('smenu_p').style.display='none';}
		if (document.getElementById('smenu_q')) {document.getElementById('smenu_q').style.display='none';}
		if (document.getElementById('smenu_r')) {document.getElementById('smenu_r').style.display='none';}
		if (document.getElementById('smenu_s')) {document.getElementById('smenu_s').style.display='none';}
		if (document.getElementById('smenu_t')) {document.getElementById('smenu_t').style.display='none';}
		if (document.getElementById('smenu_u')) {document.getElementById('smenu_u').style.display='none';}
		if (document.getElementById('smenu_v')) {document.getElementById('smenu_v').style.display='none';}
		if (document.getElementById('smenu_w')) {document.getElementById('smenu_w').style.display='none';}
		if (document.getElementById('smenu_x')) {document.getElementById('smenu_x').style.display='none';}
		if (document.getElementById('smenu_y')) {document.getElementById('smenu_y').style.display='none';}
		if (document.getElementById('smenu_z')) {document.getElementById('smenu_z').style.display='none';}
		if (d) {d.style.display='block';}
		setCookie("lettera", id, 1);
}

function settamenu() {
var primalettera = getCookie("lettera");
	if (primalettera != ""){
	 montre(primalettera);
	 }else{
	  montre();
	};
}
window.onload = settamenu;