ddacordian.js v2

    //** Accordion Content script: By Dynamic Drive, at http://www.dynamicdrive.com
    //** Created: Jan 7th, 08'. Last updated: June 7th, 2010 to v1.9

    //Version 1.9: June 7th, 2010':
    //**1) Ajax content support added, so a given header's content can be dynamically fetched from an external file and on demand.
    //**2) Optimized script performance by caching header and content container references


    var ddaccordion={
            ajaxloadingmsg: '<img src="loading2.gif" /><br />Loading Content...', //customize HTML to output while Ajax content is being fetched (if applicable)

            headergroup: {}, //object to store corresponding header group based on headerclass value
            contentgroup: {}, //object to store corresponding content group based on headerclass value

            preloadimages:function($images){
                    $images.each(function(){
                            var preloadimage=new Image()
                            preloadimage.src=this.src
                    })
            },

            expandone:function(headerclass, selected){ //PUBLIC function to expand a particular header
                    this.toggleone(headerclass, selected, "expand")
            },

            collapseone:function(headerclass, selected){ //PUBLIC function to collapse a particular header
                    this.toggleone(headerclass, selected, "collapse")
            },

            expandall:function(headerclass){ //PUBLIC function to expand all headers based on their shared CSS classname
                    var $headers=this.headergroup[headerclass]
                    this.contentgroup[headerclass].filter(':hidden').each(function(){
                            $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
                    })
            },

            collapseall:function(headerclass){ //PUBLIC function to collapse all headers based on their shared CSS classname
                    var $headers=this.headergroup[headerclass]
                    this.contentgroup[headerclass].filter(':visible').each(function(){
                            $headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
                    })
            },

            toggleone:function(headerclass, selected, optstate){ //PUBLIC function to expand/ collapse a particular header
                    var $targetHeader=this.headergroup[headerclass].eq(selected)
                    var $subcontent=this.contentgroup[headerclass].eq(selected)
                    if (typeof optstate=="undefined" || optstate=="expand" && $subcontent.is(":hidden") || optstate=="collapse" && $subcontent.is(":visible"))
                            $targetHeader.trigger("evt_accordion")
            },

            ajaxloadcontent:function($targetHeader, $targetContent, config, callback){
                    var ajaxinfo=$targetHeader.data('ajaxinfo')

                    function handlecontent(content){ //nested function
                            if (content){ //if ajax content has loaded
                                    ajaxinfo.cacheddata=content //remember ajax content
                                    ajaxinfo.status="cached" //set ajax status to cached
                                    if ($targetContent.queue("fx").length==0){ //if this content isn't currently expanding or collapsing
                                            $targetContent.hide().html(content) //hide loading message, then set sub content's HTML to ajax content
                                            ajaxinfo.status="complete" //set ajax status to complete
                                            callback() //execute callback function- expand this sub content
                                    }
                            }
                            if (ajaxinfo.status!="complete"){
                                    setTimeout(function(){handlecontent(ajaxinfo.cacheddata)}, 100) //call handlecontent() again until ajax content has loaded (ajaxinfo.cacheddata contains data)
                            }
                    } //end nested function

                    if (ajaxinfo.status=="none"){ //ajax data hasn't been fetched yet
                            $targetContent.html(this.ajaxloadingmsg)
                            $targetContent.slideDown(config.animatespeed)
                            ajaxinfo.status="loading" //set ajax status to "loading"
                            $.ajax({
                                    url: ajaxinfo.url, //path to external menu file
                                    error:function(ajaxrequest){
                                            handlecontent('Error fetching content. Server Response: '+ajaxrequest.responseText)
                                    },
                                    success:function(content){
                                            content=(content=="")? " " : content //if returned content is empty, set it to "space" is content no longer returns false/empty (hasn't loaded yet)
                                            handlecontent(content)
                                    }
                            })
                    }
                    else if (ajaxinfo.status=="loading")
                            handlecontent(ajaxinfo.cacheddata)
            },

            expandit:function($targetHeader, $targetContent, config, useractivated, directclick, skipanimation){
                    var ajaxinfo=$targetHeader.data('ajaxinfo')
                    if (ajaxinfo){ //if this content should be fetched via Ajax
                            if (ajaxinfo.status=="none" || ajaxinfo.status=="loading")
                                    this.ajaxloadcontent($targetHeader, $targetContent, config, function(){ddaccordion.expandit($targetHeader, $targetContent, config, useractivated, directclick)})
                            else if (ajaxinfo.status=="cached"){
                                    $targetContent.html(ajaxinfo.cacheddata)
                                    ajaxinfo.cacheddata=null
                                    ajaxinfo.status="complete"
                            }
                    }
                    this.transformHeader($targetHeader, config, "expand")
                    $targetContent.slideDown(skipanimation? 0 : config.animatespeed, function(){
                            config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)
                            if (config.postreveal=="gotourl" && directclick){ //if revealtype is "Go to Header URL upon click", and this is a direct click on the header
                                    var targetLink=($targetHeader.is("a"))? $targetHeader.get(0) : $targetHeader.find('a:eq(0)').get(0)
                                    if (targetLink) //if this header is a link
                                            setTimeout(function(){location=targetLink.href}, 200) //ignore link target, as window.open(targetLink, targetLink.target) doesn't work in FF if popup blocker enabled
                            }
                    })
            },

            collapseit:function($targetHeader, $targetContent, config, isuseractivated){
                    this.transformHeader($targetHeader, config, "collapse")
                    $targetContent.slideUp(config.animatespeed, function(){config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated)})
            },

            transformHeader:function($targetHeader, config, state){
                    $targetHeader.addClass((state=="expand")? config.cssclass.expand : config.cssclass.collapse) //alternate btw "expand" and "collapse" CSS classes
                    .removeClass((state=="expand")? config.cssclass.collapse : config.cssclass.expand)
                    if (config.htmlsetting.location=='src'){ //Change header image (assuming header is an image)?
                            $targetHeader=($targetHeader.is("img"))? $targetHeader : $targetHeader.find('img').eq(0) //Set target to either header itself, or first image within header
                            $targetHeader.attr('src', (state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse) //change header image
                    }
                    else if (config.htmlsetting.location=="prefix") //if change "prefix" HTML, locate dynamically added ".accordprefix" span tag and change it
                            $targetHeader.find('.accordprefix').html((state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse)
                    else if (config.htmlsetting.location=="suffix")
                            $targetHeader.find('.accordsuffix').html((state=="expand")? config.htmlsetting.expand : config.htmlsetting.collapse)
            },

            urlparamselect:function(headerclass){
                    var result=window.location.search.match(new RegExp(headerclass+"=((\\d+)(,(\\d+))*)", "i")) //check for "?headerclass=2,3,4" in URL
                    if (result!=null)
                            result=RegExp.$1.split(',')
                    return result //returns null, [index], or [index1,index2,etc], where index are the desired selected header indices
            },

            getCookie:function(Name){
                    var re=new RegExp(Name+"=[^;]+", "i") //construct RE to search for target name/value pair
                    if (document.cookie.match(re)) //if cookie found
                            return document.cookie.match(re)[0].split("=")[1] //return its value
                    return null
            },

            setCookie:function(name, value){
                    document.cookie = name + "=" + value + "; path=/"
            },

            init:function(config){
            document.write('<style type="text/css">\n')
            document.write('.'+config.contentclass+'{display: none}\n') //generate CSS to hide contents
            document.write('a.hiddenajaxlink{display: none}\n') //CSS class to hide ajax link
            document.write('<\/style>')
            jQuery(document).ready(function($){
                    ddaccordion.urlparamselect(config.headerclass)
                    var persistedheaders=ddaccordion.getCookie(config.headerclass)
                    ddaccordion.headergroup[config.headerclass]=$('.'+config.headerclass) //remember header group for this accordion
                    ddaccordion.contentgroup[config.headerclass]=$('.'+config.contentclass) //remember content group for this accordion
                    var $headers=ddaccordion.headergroup[config.headerclass]
                    var $subcontents=ddaccordion.contentgroup[config.headerclass]
                    config.cssclass={collapse: config.toggleclass[0], expand: config.toggleclass[1]} //store expand and contract CSS classes as object properties
                    config.revealtype=config.revealtype || "click"
                    config.revealtype=config.revealtype.replace(/mouseover/i, "mouseenter")
                    if (config.revealtype=="clickgo"){
                            config.postreveal="gotourl" //remember added action
                            config.revealtype="click" //overwrite revealtype to "click" keyword
                    }
                    if (typeof config.togglehtml=="undefined")
                            config.htmlsetting={location: "none"}
                    else
                            config.htmlsetting={location: config.togglehtml[0], collapse: config.togglehtml[1], expand: config.togglehtml[2]} //store HTML settings as object properties
                    config.oninit=(typeof config.oninit=="undefined")? function(){} : config.oninit //attach custom "oninit" event handler
                    config.onopenclose=(typeof config.onopenclose=="undefined")? function(){} : config.onopenclose //attach custom "onopenclose" event handler
                    var lastexpanded={} //object to hold reference to last expanded header and content (jquery objects)
                    var expandedindices=ddaccordion.urlparamselect(config.headerclass) || ((config.persiststate && persistedheaders!=null)? persistedheaders : config.defaultexpanded)
                    if (typeof expandedindices=='string') //test for string value (exception is config.defaultexpanded, which is an array)
                            expandedindices=expandedindices.replace(/c/ig, '').split(',') //transform string value to an array (ie: "c1,c2,c3" becomes [1,2,3]
                    if (expandedindices.length==1 && expandedindices[0]=="-1") //check for expandedindices value of [-1], indicating persistence is on and no content expanded
                            expandedindices=[]
                    if (config["collapseprev"] && expandedindices.length>1) //only allow one content open?
                            expandedindices=[expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
                    if (config["onemustopen"] && expandedindices.length==0) //if at least one content should be open at all times and none are, open 1st header
                            expandedindices=[0]
                    $headers.each(function(index){ //loop through all headers
                            var $header=$(this)
                            if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $header.html()!=""){ //add a SPAN element to header depending on user setting and if header is a container tag
                                    $('<span class="accordprefix"></span>').prependTo(this)
                                    $('<span class="accordsuffix"></span>').appendTo(this)
                            }
                            $header.attr('headerindex', index+'h') //store position of this header relative to its peers
                            $subcontents.eq(index).attr('contentindex', index+'c') //store position of this content relative to its peers
                            var $subcontent=$subcontents.eq(index)
                            var $hiddenajaxlink=$subcontent.find('a.hiddenajaxlink:eq(0)') //see if this content should be loaded via ajax
                            if ($hiddenajaxlink.length==1){
                                    $header.data('ajaxinfo', {url:$hiddenajaxlink.attr('href'), cacheddata:null, status:'none'}) //store info about this ajax content inside header
                            }
                            var needle=(typeof expandedindices[0]=="number")? index : index+'' //check for data type within expandedindices array- index should match that type
                            if (jQuery.inArray(needle, expandedindices)!=-1){ //check for headers that should be expanded automatically (convert index to string first)
                                    ddaccordion.expandit($header, $subcontent, config, false, false, !config.animatedefault) //3rd last param sets 'isuseractivated' parameter, 2nd last sets isdirectclick, last sets skipanimation param
                                    lastexpanded={$header:$header, $content:$subcontent}
                            }  //end check
                            else{
                                    $subcontent.hide()
                                    config.onopenclose($header.get(0), parseInt($header.attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
                                    ddaccordion.transformHeader($header, config, "collapse")
                            }
                    })
                    $headers.bind("evt_accordion", function(e, isdirectclick){ //assign CUSTOM event handler that expands/ contacts a header
                                    var $subcontent=$subcontents.eq(parseInt($(this).attr('headerindex'))) //get subcontent that should be expanded/collapsed
                                    if ($subcontent.css('display')=="none"){
                                            ddaccordion.expandit($(this), $subcontent, config, true, isdirectclick) //2nd last param sets 'isuseractivated' parameter
                                            if (config["collapseprev"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){ //collapse previous content?
                                                    ddaccordion.collapseit(lastexpanded.$header, lastexpanded.$content, config, true) //Last Boolean value sets 'isuseractivated' parameter
                                            }
                                            lastexpanded={$header:$(this), $content:$subcontent}
                                    }
                                    else if (!config["onemustopen"] || config["onemustopen"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){
                                            ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter
                                    }
                    })
                    $headers.bind(config.revealtype, function(){
                            if (config.revealtype=="mouseenter"){
                                    clearTimeout(config.revealdelay)
                                    var headerindex=parseInt($(this).attr("headerindex"))
                                    config.revealdelay=setTimeout(function(){ddaccordion.expandone(config["headerclass"], headerindex)}, config.mouseoverdelay || 0)
                            }
                            else{
                                    $(this).trigger("evt_accordion", [true])
                                    //last parameter indicates this is a direct click on the header

                                    target=$(this).find("a");
                                    console.log('false=' + $(target).attr('href'));
                                    if($(target).attr('href'))
                                    {
                                            console.log('goto');
                                            url=$(target).attr('href');
                                            window.location = url;
                                    }

                                    return false //cancel default click behavior
                            }
                    })
                    $headers.bind("mouseleave", function(){
                            clearTimeout(config.revealdelay)
                    })
                    config.oninit($headers.get(), expandedindices)
                    $(window).bind('unload', function(){ //clean up and persist on page unload
                            $headers.unbind()
                            var expandedindices=[]
                            $subcontents.filter(':visible').each(function(index){ //get indices of expanded headers
                                    expandedindices.push($(this).attr('contentindex'))
                            })
                            if (config.persiststate==true && $headers.length>0){ //persist state?
                                    expandedindices=(expandedindices.length==0)? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
                                    ddaccordion.setCookie(config.headerclass, expandedindices)
                            }
                    })
            })
            }
    }

    //preload any images defined inside ajaxloadingmsg variable
    ddaccordion.preloadimages(jQuery(ddaccordion.ajaxloadingmsg).filter('img'))