<script>
cookie = {
     add: function (name, value, days) {
         if (days) {
             var date = new Date();
             date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
             var expires = "; expires=" + date.toGMTString();
         } else var expires = "";
         document.cookie = name + "=" + value + expires + "; path=/";
     },
     read: function (name) {
         var nameEQ = name + "=";
         var ca = document.cookie.split(';');
         for (var i = 0; i < ca.length; i++) {
             var c = ca[i];
             while (c.charAt(0) == ' ') c = c.substring(1, c.length);
             if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
         }
         return null;
     },
     delete: function (name) {
         cookie.add(name, "", -1);
     }
}
</script>