var accordion={
	
	cntntclassname:{}, //object to store corresponding cntnt_class name based on header_class

	one_expand:function(header_class, selected){ //PUBLIC function to expand a particular header
		this.one_toggle(header_class, selected, "expand")
	},

	one_collapse:function(header_class, selected){ //PUBLIC function to collapse a particular header
		this.one_toggle(header_class, selected, "collapse")
	},

	all_expand:function(header_class){ //PUBLIC function to expand all headers based on their shared CSS classname
		var $=jQuery
		var $headers=$('.'+header_class)
		$('.'+this.cntntclassname[header_class]+':hidden').each(function(){
			$headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
		})
	},

	all_collapse:function(header_class){ //PUBLIC function to collapse all headers based on their shared CSS classname
		var $=jQuery
		var $headers=$('.'+header_class)
		$('.'+this.cntntclassname[header_class]+':visible').each(function(){
			$headers.eq(parseInt($(this).attr('contentindex'))).trigger("evt_accordion")
		})
	},

	one_toggle:function(header_class, selected, optstate){ //PUBLIC function to expand/ collapse a particular header
		var $=jQuery
		var $targetHeader=$('.'+header_class).eq(selected)
		var $subcontent=$('.'+this.cntntclassname[header_class]).eq(selected)
		if (typeof optstate=="undefined" || optstate=="expand" && $subcontent.is(":hidden") || optstate=="collapse" && $subcontent.is(":visible"))
			$targetHeader.trigger("evt_accordion")
	},

	it_expand:function($targetHeader, $targetContent, parameters, useractivated, directclick){
		this.Header_transform($targetHeader, parameters, "expand")
		$targetContent.slideDown(parameters.speed, function(){
			parameters.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), useractivated)
			if (parameters.postreveal=="gotourl" && directclick){ //if rvl_type is "Go to Header URL upon click", and this is a direct click on the header
				var targetLink=($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
			}
		})
	},

	it_collapse:function($targetHeader, $targetContent, parameters, isuseractivated){
		this.Header_transform($targetHeader, parameters, "collapse")
		$targetContent.slideUp(parameters.speed, function(){parameters.onopenclose($targetHeader.get(0), parseInt($targetHeader.attr('headerindex')), $targetContent.css('display'), isuseractivated)})
	},

	Header_transform:function($targetHeader, parameters, state){
		$targetHeader.addClass((state=="expand")? parameters.cssclass.expand : parameters.cssclass.collapse) //alternate btw "expand" and "collapse" CSS classes
		.removeClass((state=="expand")? parameters.cssclass.collapse : parameters.cssclass.expand)
		if (parameters.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")? parameters.htmlsetting.expand : parameters.htmlsetting.collapse) //change header image
		}
		else if (parameters.htmlsetting.location=="prefix") //if change "prefix" HTML, locate dynamically added ".accordprefix" span tag and change it
			$targetHeader.find('.accordprefix').html((state=="expand")? parameters.htmlsetting.expand : parameters.htmlsetting.collapse)
		else if (parameters.htmlsetting.location=="suffix")
			$targetHeader.find('.accordsuffix').html((state=="expand")? parameters.htmlsetting.expand : parameters.htmlsetting.collapse)
	},

	urlparamselect:function(header_class){
		var result=window.location.search.match(new RegExp(header_class+"=((\\d+)(,(\\d+))*)", "i")) //check for "?header_class=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=/"
	},

	initialize:function(parameters){
	document.write('<style type="text/css">\n')
	document.write('.'+parameters.cntnt_class+'{display: none}\n') //generate CSS to hide contents
	document.write('<\/style>')
	jQuery(document).ready(function($){
		accordion.urlparamselect(parameters.header_class)
		var persistedheaders=accordion.getCookie(parameters.header_class)
		accordion.cntntclassname[parameters.header_class]=parameters.cntnt_class //remember cntnt_class name based on header_class
		parameters.cssclass={collapse: parameters.tgl_class[0], expand: parameters.tgl_class[1]} //store expand and contract CSS classes as object properties
		parameters.rvl_type=parameters.rvl_type || "click"
		parameters.rvl_type=parameters.rvl_type.replace(/mouseover/i, "mouseenter")
		if (parameters.rvl_type=="clickgo"){
			parameters.postreveal="gotourl" //remember added action
			parameters.rvl_type="click" //overwrite rvl_type to "click" keyword
		}
		if (typeof parameters.tgl_html=="undefined")
			parameters.htmlsetting={location: "none"}
		else
			parameters.htmlsetting={location: parameters.tgl_html[0], collapse: parameters.tgl_html[1], expand: parameters.tgl_html[2]} //store HTML settings as object properties
		parameters.oninit=(typeof parameters.oninit=="undefined")? function(){} : parameters.oninit //attach custom "oninit" event handler
		parameters.onopenclose=(typeof parameters.onopenclose=="undefined")? function(){} : parameters.onopenclose //attach custom "onopenclose" event handler
		var lastexpanded={} //object to hold reference to last expanded header and content (jquery objects)
		var expandedindices=accordion.urlparamselect(parameters.header_class) || ((parameters.persist_state && persistedheaders!=null)? persistedheaders : parameters.default_ex)
		if (typeof expandedindices=='string') //test for string value (exception is parameters.default, 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 $subcontents=$('.'+parameters["cntnt_class"])
		if (expandedindices.length==1 && expandedindices[0]=="-1") //check for expandedindices value of [-1], indicating persistence is on and no content expanded
			expandedindices=[]
		if (parameters["prev_collapse"] && expandedindices.length>1) //only allow one content open?
			expandedindices=[expandedindices.pop()] //return last array element as an array (for sake of jQuery.inArray())
		if (parameters["must_open"] && expandedindices.length==0) //if at least one content should be open at all times and none are, open 1st header
			expandedindices=[0]
		$('.'+parameters["header_class"]).each(function(index){ //loop through all headers
			if (/(prefix)|(suffix)/i.test(parameters.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 (parameters.default_animate==false)
					$subcontent.show()
				accordion.it_expand($(this), $subcontent, parameters, false) //Last param sets 'isuseractivated' parameter
				lastexpanded={$header:$(this), $content:$subcontent}
			}  //end check
			else{
				$subcontent.hide()
				parameters.onopenclose($(this).get(0), parseInt($(this).attr('headerindex')), $subcontent.css('display'), false) //Last Boolean value sets 'isuseractivated' parameter
				accordion.Header_transform($(this), parameters, "collapse")
			}
		})
		$('.'+parameters["header_class"]).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"){
					accordion.it_expand($(this), $subcontent, parameters, true, isdirectclick) //2nd last param sets 'isuseractivated' parameter
					if (parameters["prev_collapse"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){ //collapse previous content?
						accordion.it_collapse(lastexpanded.$header, lastexpanded.$content, parameters, true) //Last Boolean value sets 'isuseractivated' parameter
					}
					lastexpanded={$header:$(this), $content:$subcontent}
				}
				else if (!parameters["must_open"] || parameters["must_open"] && lastexpanded.$header && $(this).get(0)!=lastexpanded.$header.get(0)){
					accordion.it_collapse($(this), $subcontent, parameters, true) //Last Boolean value sets 'isuseractivated' parameter
				}
 		})
		$('.'+parameters["header_class"]).bind(parameters.rvl_type, function(){
			if (parameters.rvl_type=="mouseenter"){
				clearTimeout(parameters.revealdelay)
				var headerindex=parseInt($(this).attr("headerindex"))
				parameters.revealdelay=setTimeout(function(){accordion.one_expand(parameters["header_class"], headerindex)}, parameters.mouseover_delay || 0)
			}
			else{
				$(this).trigger("evt_accordion", [true])
				return false //cancel default click behavior
			}
		})
		$('.'+parameters["header_class"]).bind("mouseleave", function(){
			clearTimeout(parameters.revealdelay)
		})
		parameters.oninit($('.'+parameters["header_class"]).get(), expandedindices)
		$(window).bind('unload', function(){ //clean up and persist on page unload
			$('.'+parameters["header_class"]).unbind()
			var expandedindices=[]
			$('.'+parameters["cntnt_class"]+":visible").each(function(index){ //get indices of expanded headers
				expandedindices.push($(this).attr('contentindex'))
			})
			if (parameters.persist_state==true && $('.'+parameters["header_class"]).length>0){ //persist state?
				expandedindices=(expandedindices.length==0)? '-1c' : expandedindices //No contents expanded, indicate that with dummy '-1c' value?
				accordion.setCookie(parameters.header_class, expandedindices)
			}
		})
	})
	}
}