/**
* @license
* jQuery Tools @VERSION 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: @DATE
*/
(function($) {

var hash, iframe, links, inited;

$.tools = $.tools || {version: '@VERSION'};

$.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);

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 {
links.eq(0).trigger("history", [h]);
}

hash = h;

});


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

$.tools.history.init(this);

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

})(jQuery);