var animatedcollapse=
{
	divholders: {},
	divgroups: {},
	lastactiveingroup: {},
	preloadimages: [],

	show:function(divids)
	{
		if (typeof divids=="object")
		{
			for (var i=0; i<divids.length; i++)
				this.showhide(divids[i], "show")
		}
		else
			this.showhide(divids, "show")
	},

	hide:function(divids)
	{
		if (typeof divids=="object")
		{
			for (var i=0; i<divids.length; i++)
				this.showhide(divids[i], "hide")
		}
		else
			this.showhide(divids, "hide")
	},

	toggle:function(divid)
	{
		if (typeof divid=="object")
			divid=divid[0]
		this.showhide(divid, "toggle")
	},

	addDiv:function(divid, attrstring)
	{
		this.divholders[divid]=({id: divid, $divref: null, attrs: attrstring})
		this.divholders[divid].getAttr=function(name)
		{
			var attr=new RegExp(name+"=([^,]+)", "i")
			return (attr.test(this.attrs) && parseInt(RegExp.$1)!=0)? RegExp.$1 : null
		}
		this.currentid=divid
		return this
	},

	showhide:function(divid, action)
	{
		var $divref=this.divholders[divid].$divref
		
		if (this.divholders[divid] && $divref.length==1)
		{
			var targetgroup=this.divgroups[$divref.attr('groupname')]
			if ($divref.attr('groupname') && targetgroup.count>1 && (action=="show" || action=="toggle" && $divref.css('display')=='none'))
			{
				if (targetgroup.lastactivedivid && targetgroup.lastactivedivid!=divid)
					this.slideengine(targetgroup.lastactivedivid, 'hide')
				this.slideengine(divid, 'show')
				targetgroup.lastactivedivid=divid
			}
			else
			{
				this.slideengine(divid, action)
			}
		}
	},
	
	slideengine:function(divid, action)
	{
		var $divref=this.divholders[divid].$divref
		var $togglerimage=this.divholders[divid].$togglerimage
		if (this.divholders[divid] && $divref.length==1)
		{
			var animateSetting={height: action}
			if ($divref.attr('fade'))
				animateSetting.opacity=action
			$divref.animate(animateSetting, $divref.attr('speed')? parseInt($divref.attr('speed')) : 500, function()
			{
				if ($togglerimage){
					$togglerimage.attr('src', ($divref.css('display')=="none")? $togglerimage.data('srcs').closed : $togglerimage.data('srcs').open)
				}
				if (animatedcollapse.ontoggle)
				{
					try
					{
						animatedcollapse.ontoggle(jQuery, $divref.get(0), $divref.css('display'))
					}
					catch(e)
					{
						alert("An error exists inside your \"ontoggle\" function:\n\n"+e+"\n\nAborting execution of function.")
					}
				}
			})
			return false
		}
	},

	generatemap:function()
	{
		var map={}
		for (var i=0; i<arguments.length; i++)
		{
			if (arguments[i][1]!=null)
			{
				map[arguments[i][0]]=arguments[i][1]
			}
		}
		return map
	},

	init:function()
	{
		var ac=this
		jQuery(document).ready(function($)
		{
			animatedcollapse.ontoggle=animatedcollapse.ontoggle || null
			var urlparamopenids=animatedcollapse.urlparamselect()
			var persistopenids=ac.getCookie('acopendivids')
			var groupswithpersist=ac.getCookie('acgroupswithpersist')
			
			if (persistopenids!=null)
				persistopenids=(persistopenids=='nada')? [] : persistopenids.split(',')
			groupswithpersist=(groupswithpersist==null || groupswithpersist=='nada')? [] : groupswithpersist.split(',')
			
			
			jQuery.each(ac.divholders, function()
			{
				this.$divref=$('#'+this.id)
				if ((this.getAttr('persist') || jQuery.inArray(this.getAttr('group'), groupswithpersist)!=-1) && persistopenids!=null)
				{
					var cssdisplay=(jQuery.inArray(this.id, persistopenids)!=-1)? 'block' : 'none'
				}
				else
				{
					var cssdisplay=this.getAttr('hide')? 'none' : null
				}
				if (urlparamopenids[0]=="all" || jQuery.inArray(this.id, urlparamopenids)!=-1)
				{
					cssdisplay='block'
				}
				else if (urlparamopenids[0]=="none")
				{
					cssdisplay='none'
				}
				this.$divref.css(ac.generatemap(['height', this.getAttr('height')], ['display', cssdisplay]))
				this.$divref.attr(ac.generatemap(['groupname', this.getAttr('group')], ['fade', this.getAttr('fade')], ['speed', this.getAttr('speed')]))
				if (this.getAttr('group'))
				{
					var targetgroup=ac.divgroups[this.getAttr('group')] || (ac.divgroups[this.getAttr('group')]={})
					targetgroup.count=(targetgroup.count||0)+1 //count # of DIVs within this group
					if (jQuery.inArray(this.id, urlparamopenids)!=-1){ //if url parameter string contains this div's ID
						targetgroup.lastactivedivid=this.id //remember this DIV as the last "active" DIV (this DIV will be expanded). Overrides other settings
						targetgroup.overridepersist=1 //Indicate to override persisted div that would have been expanded
					}
					if (!targetgroup.lastactivedivid && this.$divref.css('display')!='none' || cssdisplay=="block" && typeof targetgroup.overridepersist=="undefined") //if this DIV was open by default or should be open due to persistence								
						targetgroup.lastactivedivid=this.id //remember this DIV as the last "active" DIV (this DIV will be expanded)
					this.$divref.css({display:'none'}) //hide any DIV that's part of said group for now
				}
			}) //end divholders.each
			jQuery.each(ac.divgroups, function()
			{ //loop through each group
				if (this.lastactivedivid && urlparamopenids[0]!="none") //show last "active" DIV within each group (one that should be expanded), unless url param="none"
					ac.divholders[this.lastactivedivid].$divref.show()
			})
			if (animatedcollapse.ontoggle)
			{
				jQuery.each(ac.divholders, function()
				{ //loop through each collapsible DIV object and fire ontoggle event
					animatedcollapse.ontoggle(jQuery, this.$divref.get(0), this.$divref.css('display'))
				})
			}
			//Parse page for links containing rel attribute
			var $allcontrols=$('a[rel]').filter('[rel^="collapse["], [rel^="expand["], [rel^="toggle["]') //get all elements on page with rel="collapse[]", "expand[]" and "toggle[]"
			$allcontrols.each(function()
			{ //loop though each control link
				this._divids=this.getAttribute('rel').replace(/(^\w+)|(\s+)/g, "").replace(/[\[\]']/g, "") //cache value 'div1,div2,etc' within identifier[div1,div2,etc]
				if (this.getElementsByTagName('img').length==1 && ac.divholders[this._divids]){ //if control is an image link that toggles a single DIV (must be one to one to update status image)
					animatedcollapse.preloadimage(this.getAttribute('data-openimage'), this.getAttribute('data-closedimage')) //preload control images (if defined)
					$togglerimage=$(this).find('img').eq(0).data('srcs', {open:this.getAttribute('data-openimage'), closed:this.getAttribute('data-closedimage')}) //remember open and closed images' paths
					ac.divholders[this._divids].$togglerimage=$(this).find('img').eq(0) //save reference to toggler image (to be updated inside slideengine()
					ac.divholders[this._divids].$togglerimage.attr('src', (ac.divholders[this._divids].$divref.css('display')=="none")? $togglerimage.data('srcs').closed : $togglerimage.data('srcs').open)
				}
				$(this).click(function(){ //assign click behavior to each control link
					var relattr=this.getAttribute('rel')
					var divids=(this._divids=="")? [] : this._divids.split(',') //convert 'div1,div2,etc' to array 
					if (divids.length>0){
						animatedcollapse[/expand/i.test(relattr)? 'show' : /collapse/i.test(relattr)? 'hide' : 'toggle'](divids) //call corresponding public function
						return false
					}
				}) //end control.click
			})// end control.each
			
			$(window).bind('unload', function()
			{
				ac.uninit()
			})
		}) //end doc.ready()
	},
	
	uninit:function()
	{
		var opendivids='', groupswithpersist=''
		jQuery.each(this.divholders, function()
		{
			if (this.$divref.css('display')!='none')
			{
				opendivids+=this.id+',' //store ids of DIVs that are expanded when page unloads: 'div1,div2,etc'
			}
			if (this.getAttr('group') && this.getAttr('persist'))
				groupswithpersist+=this.getAttr('group')+',' //store groups with which at least one DIV has persistance enabled: 'group1,group2,etc'
		})
		opendivids=(opendivids=='')? 'nada' : opendivids.replace(/,$/, '')
		groupswithpersist=(groupswithpersist=='')? 'nada' : groupswithpersist.replace(/,$/, '')
		this.setCookie('acopendivids', opendivids)
		this.setCookie('acgroupswithpersist', groupswithpersist)
	},
	
	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, days)
	{
		if (typeof days!="undefined")
		{ //if set persistent cookie
			var expireDate = new Date()
			expireDate.setDate(expireDate.getDate()+days)
			document.cookie = name+"="+value+"; path=/; expires="+expireDate.toGMTString()
		}
		else //else if this is a session only cookie
			document.cookie = name+"="+value+"; path=/"
	},
	
	urlparamselect:function()
	{
		window.location.search.match(/expanddiv=([\w\-_,]+)/i) //search for expanddiv=divid or divid1,divid2,etc
		return (RegExp.$1!="")? RegExp.$1.split(",") : []
	},
	
	preloadimage:function()
	{
		var preloadimages=this.preloadimages
		for (var i=0; i<arguments.length; i++)
		{
			if (arguments[i] && arguments[i].length>0)
			{
				preloadimages[preloadimages.length]=new Image()
				preloadimages[preloadimages.length-1].src=arguments[i]
			}
		}
	}
}