//Accordion Content script: By Dynamic Drive, at http://www.dynamicdrive.com
//Created: Jan 7th, 08'
//Version 1.3: April 3rd, 08':
//**1) Script now no longer conflicts with other JS frameworks
//**2) Adds custom oninit() and onopenclose() event handlers that fire when Accordion Content instance has initialized, plus whenever a header is opened/closed
//**3) Adds support for expanding header(s) using the URL parameter (ie: http://mysite.com/accordion.htm?headerclass=0,1)
//April 9th, 08': Fixed "defaultexpanded" setting not working when page first loads
//Version 1.4: June 4th, 08':
//**1) Added option to activate a header "mouseover" instead of the default "click"
//**2) Bug persistence not working when used with jquery 1.2.6
//Version 1.5: June 20th, 08':
//**1) Adds new "onemustopen:true/false" parameter, which lets you set whether at least one header should be open at all times (so never all closed).
//**2) Changed cookie path to site wide for persistence feature
//**3) Fixed bug so "expandedindices" parameter in oninit(headers, expandedindices) returns empty array [] instead of [-1] when no expanded headers found
//Version 1.5.1: June 27th, 08': Fixed "defaultexpanded" setting not working properly when used with jquery 1.2.6
var ddaccordion={
	contentclassname:{}, //object to store corresponding contentclass name based on headerclass
	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 $=jQuery
		var $headers=$('.'+headerclass)
		$('.'+this.contentclassname[headerclass]+':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 $=jQuery
		var $headers=$('.'+headerclass)
		$('.'+this.contentclassname[headerclass]+':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 $=jQuery
		var $targetHeader=$('.'+headerclass).eq(selected)
		var $subcontent=$('.'+this.contentclassname[headerclass]).eq(selected)
		if (typeof optstate=="undefined" || optstate=="expand" && $subcontent.is(":hidden") || optstate=="collapse" && $subcontent.is(":visible"))
			$targetHeader.trigger("evt_accordion")
	},
	expandit:function($targetHeader, $targetContent, config, useractivated){
		$targetContent.slideDown(config.animatespeed, function(){config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)})
		this.transformHeader($targetHeader, config, "expand")
	},
	collapseit:function($targetHeader, $targetContent, config, isuseractivated){
		$targetContent.slideUp(config.animatespeed, function(){config.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated)})
		this.transformHeader($targetHeader, config, "collapse")
	},
	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('<\/style>')

	jQuery(document).ready(function($){
		ddaccordion.urlparamselect(config.headerclass)
		var persistedheaders=ddaccordion.getCookie(config.headerclass)
		ddaccordion.contentclassname[config.headerclass]=config.contentclass //remember contentclass name based on headerclass
		config.cssclass={collapse: config.toggleclass[0], expand: config.toggleclass[1]} //store expand and contract CSS classes as object properties
		config.revealtype=/^(click)|(mouseover)$/i.test(config.revealtype)? config.revealtype.replace(/mouseover/i, "mouseenter") : "click"
		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]

		var $subcontents=$('.'+config["contentclass"])

		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]

		$('.'+config["headerclass"]).each(function(index){ //loop through all headers

			if (/(prefix)|(suffix)/i.test(config.htmlsetting.location) && $(this).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)

			}

			$(this).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 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)

				if (config.animatedefault==false)

					$subcontent.show()

				ddaccordion.expandit($(this), $subcontent, config, false) //Last Boolean value sets 'isuseractivated' parameter

				lastexpanded={$header:$(this), $content:$subcontent}

			}  //end check

			else{

				$subcontent.hide()

				config.onopenclose($(this).get(0), parseInt($(this).attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter

				ddaccordion.transformHeader($(this), config, "collapse")

			}

		})

		$('.'+config["headerclass"]).bind("evt_accordion", function(){ //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) //Last Boolean value 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{

					ddaccordion.collapseit($(this), $subcontent, config, true) //Last Boolean value sets 'isuseractivated' parameter

				}

 		})

		$('.'+config["headerclass"]).bind(config.revealtype, function(){

			if (config.revealtype=="mouseenter"){

				ddaccordion.expandone(config["headerclass"], parseInt($(this).attr("headerindex")))

			}

			else{

				$(this).trigger("evt_accordion")

				return false //cancel default click behavior

			}

		})

		config.oninit($('.'+config["headerclass"]).get(), expandedindices)

		$(window).bind('unload', function(){ //clean up and persist on page unload

			$('.'+config["headerclass"]).unbind()

			var expandedindices=[]

			$('.'+config["contentclass"]+":visible").each(function(index){ //get indices of expanded headers

				expandedindices.push($(this).attr('contentindex'))

			})

			if (config.persiststate==true){ //persist state?

				expandedindices=(expandedindices.length==0)? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?

				ddaccordion.setCookie(config.headerclass, expandedindices)

			}

		})

	})

	}

} 
																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																																														
ddaccordion.init({
	headerclass: "videos", //Shared CSS class name of headers group
	contentclass: "thelanguage", //Shared CSS class name of contents group
	revealtype: "click", //Reveal content when user clicks or onmouseover the header? Valid value: "click" or "mouseover"
	collapseprev: false, //Collapse previous content (so only one open at any time)? true/false 
	defaultexpanded: [], //index of content(s) open by default [index1, index2, etc]. [] denotes no content.
	onemustopen: false, //Specify whether at least one header should be open always (so never all headers closed)
	animatedefault: false, //Should contents open by default be animated into view?
	persiststate: false, //persist state of opened contents within browser session?
	toggleclass: ["closedlanguage", "openlanguage"], //Two CSS classes to be applied to the header when it's collapsed and expanded, respectively ["class1", "class2"]
	togglehtml: ["prefix", "<img src='http://www.layeredtech.com/_img/graphics/plus.gif' /> ", "<img src='http://www.layeredtech.com/_img/graphics/minus.gif' /> "], //Additional HTML added to the header when it's collapsed and expanded, respectively  ["position", "html1", "html2"] (see docs)
	animatespeed: "fast", //speed of animation: "fast", "normal", or "slow"
	oninit:function(expandedindices){ //custom code to run when headers have initalized
		//do nothing
	},
	onopenclose:function(header, index, state, isuseractivated){ //custom code to run whenever a header is opened or closed
		//do nothing
	}
})