function setCookie(name, value, expire)
{
  document.cookie = name + "=" + escape(value) +
    ((expire === null) ? "" : ("; expires=" + expire.toGMTString()));
}

function getCookie(name)
{
  var search = name + "=";
  var offset, end;

  if (document.cookie.length > 0) {
    offset = document.cookie.indexOf(search);

    if (offset >= 0) {
      offset += search.length;
      end = document.cookie.indexOf(";", offset);

      if (end < 0) {
        end = document.cookie.length;
      }

      return unescape(document.cookie.substring(offset, end));
    }
  }

  return null;
}