/**
* @license 
* jQuery Tools 1.2.5 History "Back button for AJAX apps"
* 
* NO COPYRIGHTS OR LICENSES. DO WHAT YOU LIKE.
* 
* http://flowplayer.org/tools/toolbox/history.html
* 
* Since: Mar 2010
* Date:    Wed Sep 22 06:02:10 2010 +0000 
*/
(function ($) {

    var hash, iframe, links, inited;
    $.tools = $.tools || { version: '1.2.5' };

    $.tools.history = {

        init: function (els) {

            if (inited) { return; }

            // IE
            if ($.browser.msie && $.browser.version < '8') {
                // create iframe that is constantly checked for hash changes
                if (!iframe) {
                    iframe = $("<iframe/>").attr("src", "javascript:false;").hide().get(0);
                    $("body").append(iframe);

                    setInterval(function () {
                        var idoc = iframe.contentWindow.document,
							 h = idoc.location.hash;

                        if (hash !== h) {
                            $.event.trigger("hash", h);
                        }
                    }, 100);

                    //HACK: removed || "#" for preventing scrolldown to iframe
                    setIframeLocation(location.hash);
                }


                // other browsers scans for location.hash changes directly without iframe hack
            } else {
                setInterval(function () {
                    var h = location.hash;
                    if (h !== hash) {
                        $.event.trigger("hash", h);
                    }
                }, 100);
            }

            links = !links ? els : links.add(els);

            els.click(function (e) {
                var href = $(this).attr("href");
                if (iframe) { setIframeLocation(href); }

                // handle non-anchor links
                if (href.slice(0, 1) != "#") {
                    location.href = "#" + href;
                    return e.preventDefault();
                }

            });

            inited = true;
        }
    };


    function setIframeLocation(h) {
        if (h) {
            var doc = iframe.contentWindow.document;
            doc.open().close();
            doc.location.hash = h;
        }
    }

    // global histroy change listener
    $(window).bind("hash", function (e, h) {
        if (h) {
            links.filter(function () {
                var href = $(this).attr("href");
                return href == h || href == h.replace("#", "");
            }).trigger("history", [h]);
        } else {
            //HACK: Must hack to get initial tab work with history
            var initialTab = $("ul.tabs > li:not(.nolink)").first().index();
            links.eq(initialTab).trigger("history", [h]);
        }

        hash = h;
    });


    // jQuery plugin implementation
    $.fn.history = function (fn) {

        $.tools.history.init(this);

        // return jQuery
        return this.bind("history", fn);
    };

})(jQuery);