function getCookie(name) {
  if (document.cookie.length > 0) {
    start=document.cookie.indexOf(name + "=")
    if (start!=-1) {
      start = start + name.length + 1
      end=document.cookie.indexOf(";", start)
      if (end == -1) {
        end = document.cookie.length;
      }
      return unescape(document.cookie.substring(start, end))
    }
  }
  return "";
}

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