(function () {

    Element.Events.hashchange = {
        onAdd: function () {
            var hash = self.location.hash;

            var hashchange = function () {
                if (hash == self.location.hash) return;
                else hash = self.location.hash;

                var value = (hash.indexOf('#') == 0 ? hash.substr(1) : hash);
                window.fireEvent('hashchange', value);
                document.fireEvent('hashchange', value);
            };

            if ("onhashchange" in window) {
                window.onhashchange = hashchange;
            } else {
                hashchange.periodical(50);
            }
        }
    };

})();