/**
 * @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);
                    
                    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);