javascript 쿠키에 저장, 불러오기

function setCookie(name, value, expiredays) {
   var todayDate = new Date();
   todayDate.setDate(todayDate.getDate() + expiredays);
   document.cookie = name + "=" + value + "; path=/; expires=" + todayDate.toGMTString() + ";"
}

function getCookie(name) {
   var start, end;
   var i = 0;
   while (i <= document.cookie.length) {
      start = i;
      end = start + name.length;
      if (document.cookie.substring(start, end) == name) {
         start = end + 1;
         end = document.cookie.indexOf(";", start);
         if (end < start)
            end = document.cookie.length;
         return document.cookie.substring(start, end)
      }
      i++
   }
   return ""
}

만료일을 지정하여 해당날짜까지 쿠키에 저장.