function setCookie (cookieName, cookieValue) {
  var date = new Date();
  date.setTime(date.getTime()+(30*60*1000));
  var expires = "; expires="+date.toGMTString();
  document.cookie = cookieName + "=" + cookieValue + expires + "; domain=www.prada.com; path=/";
}

function getCookie (cookieName) {
  var dc = document.cookie; 
  var prefix = cookieName + "="; 
  var begin = dc.indexOf("; " + prefix);
  if (begin == -1) { 
    begin = dc.indexOf(prefix);
    if (begin != 0) return null; 
  } else 
    begin += 2; 
  var end = document.cookie.indexOf(";", begin); 
  if (end == -1) 
    end = dc.length;
  return unescape(dc.substring(begin + prefix.length, end));
}