function setCookie (name, value, expirationDays, rootDomain) {
    rootDomain = (rootDomain === undefined ? false : rootDomain);
    var date = new Date()
    date.setTime(date.getTime() + (expirationDays * 24 * 60 * 60 * 1000))
    var c = name + '=' + value + ';' + 'expires=' + date.toUTCString() + ';path = /';
    if (rootDomain) {
        c += "; domain=." + window.location.hostname.split('.').slice(-2).join('.');
    }
    document.cookie = c;
  }

  function getCookie (name) {
    name += '='
    var cookies = document.cookie.split(';')
    for (var i = 0; i < cookies.length; i++) {
      var cookie = cookies[i]
      while (cookie.charAt(0) == ' ') {
        cookie = cookie.substring(1)
      }
      if (cookie.indexOf(name) == 0) {
        return cookie.substring(name.length, cookie.length)
      }
    }
    return ''
  }

  function deleteCookie (name, rootDomain) {
    rootDomain = (rootDomain === undefined ? false : rootDomain);
    
    var c = name + '=;expires=Wed, 01 Jan 1970 00:00:00 UTC; path=/';
    if (rootDomain) {
        c += ";domain=." + window.location.hostname.split('.').slice(-2).join('.');
    }

    document.cookie = c;
  }