//** DD Drop Down Panel- (c) Dynamic Drive DHTML code library: http://www.dynamicdrive.com
//** Oct 21st, 08'- Script created
//** March 23rd, 09' v1.01- Arrow images now preloaded

function ddpanel(setting){
	setting.dir="up" //initial state of panel (up="contracted")
	if (setting.stateconfig.persiststate && ddpanel.getCookie(setting.ids[0])=="down"){
		setting.dir="down"
	}
	if (setting.dir=="up"){ //if "up", output CSS to hide panel contents
		document.write('<style type="text/css">\n')
		document.write('#'+setting.ids[1]+'{height:' + parseInt(setting.stateconfig.initial) + 'px; overflow:hidden}\n')
		document.write('</style>\n')
	}
	setting.stateconfig.initial=parseInt(setting.stateconfig.initial)
	this.setting=setting
	if (setting.pointerimage.enabled){ //preload images
		var img1=new Image(), img2=new Image()
		img1.src=setting.pointerimage.src[0]
		img2.src=setting.pointerimage.src[1]
	}
	var thispanel=this
	if (window.addEventListener) //if non IE browsers, initialize panel window.onload
		ddpanel.addEvent(window, function(e){thispanel.initpanel(setting)}, "load")
	else //else if IE, add 100 millisec after window.onload before initializing
		ddpanel.addEvent(window, function(e){setTimeout(function(){thispanel.initpanel(setting)}, 100)}, "load")
	ddpanel.addEvent(window, function(e){thispanel.uninit(setting)}, "unload")
}

ddpanel.events_array=[] //object array to contain events created by script

ddpanel.addEvent=function(target, functionref, tasktype){
	var evtmodel=target.addEventListener? "w3c" : "ie"
	var evtaction=evtmodel=="w3c"? "addEventListener" : "attachEvent"
	var i=this.events_array.push({ //store event info in ddpanel.events_array[] and return current event's index within array
		target: target,
		tasktype: (evtmodel=="ie"? "on" : "")+tasktype,
		listener: evtmodel=="ie"? function(){return functionref.call(target, window.event)} : functionref
	})-1
	target[evtaction](this.events_array[i].tasktype, this.events_array[i].listener, evtmodel=="w3c"? false : null)
}

ddpanel.removeEvent=function(target, functionref, tasktype){
	var evtmodel=target.removeEventListener? "w3c" : "ie"
	var evtaction=evtmodel=="w3c"? "removeEventListener" : "detachEvent"
	target[evtaction](tasktype, functionref, evtmodel=="w3c"? false : null)
}

ddpanel.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
}

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

ddpanel.addpointer=function(target, className, imagesrc){
	var pointer=document.createElement("img")
	pointer.src=imagesrc
	pointer.className=className
	pointer.style.borderWidth=0
	target.appendChild(pointer)
	return pointer
}

ddpanel.prototype={

togglepanel:function(dir){ //public function that toggles the panel's state. Optional dir parameter ("up" or "down") to explicitly set state.
	var setting=this.setting
	setting.dir=dir || ((setting.dir=="up")? "down" : "up")
	var pcontent=setting.pcontent, dir=setting.dir
	pcontent._currentheight=(dir=="down")? pcontent._actualheight : setting.stateconfig.initial
	pcontent.style.height=pcontent._currentheight+"px"
	if (setting.pointerimage.enabled){
		setting.arrow.src=setting.pointerimage.src[(setting.dir=="down")? 1 : 0]
		setting.arrow.style.visibility="visible"
	}
	ddpanel.setCookie(setting.ids[0], setting.dir)
},

togglepanelplus:function(dir){ //public function that toggles the panel's state w/ animation. Optional dir parameter ("up" or "down") to explicitly set state.
	var setting=this.setting
	setting.dir=dir || ((setting.dir=="up")? "down" : "up")
	if (setting.pointerimage.enabled)
		setting.arrow.style.visibility="hidden"
	clearTimeout(setting.revealtimer)
	this.revealcontent()
},

revealcontent:function(){
	var setting=this.setting
	var pcontent=setting.pcontent, curH=pcontent._currentheight, maxH=pcontent._actualheight, minH=setting.stateconfig.initial, steps=setting.animate.steps, dir=setting.dir
	if (dir=="down" && curH<maxH || dir=="up" && curH>minH){
		var newH = curH + (Math.round((maxH-curH)/steps)+1) * (dir=="up"? -1 : 1)
		newH=(dir=="down")? Math.min(maxH, newH) : Math.max(minH, newH)
		pcontent.style.height=newH+"px"
		pcontent._currentheight=newH
	}
	else{
		if (setting.pointerimage.enabled){
			setting.arrow.src=setting.pointerimage.src[(setting.dir=="down")? 1 : 0]
			setting.arrow.style.visibility="visible"
		}
		return
	}
	var thispanel=this
	setting.revealtimer=setTimeout(function(){thispanel.revealcontent()}, 10)
},

initpanel:function(){
	var setting=this.setting
	var pcontainer=setting.pcontainer=document.getElementById(setting.ids[0])
	var pcontent=setting.pcontent=document.getElementById(setting.ids[1])
	var tdiv=setting.tdiv=document.getElementById(setting.ids[2])
	pcontent.style.overflow="scroll"
	pcontent._actualheight=pcontent.scrollHeight
	setTimeout(function(){pcontent._actualheight=pcontent.scrollHeight}, 100)
	pcontent.style.overflow="hidden"
	pcontent._currentheight=(setting.dir=="down")? pcontent._actualheight : setting.stateconfig.initial
	var thispanel=this
	ddpanel.addEvent(tdiv, function(e){ //assign click behavior when toggle DIV tab is clicked on
		if (setting.animate.enabled)
			thispanel.togglepanelplus()
		else
			thispanel.togglepanel()
		if (e.preventDefault) e.preventDefault()
		return false
	}, "click")
	if (setting.pointerimage.enabled){
		var pointer1=new Image(), pointer2=new Image()
		pointer1.src=setting.pointerimage.src[0]
		pointer2.src=setting.pointerimage.src[1]
		setting.arrow=ddpanel.addpointer(tdiv.getElementsByTagName("span")[0], "pointerimage", setting.pointerimage.src[setting.dir=="down"? 1:0])
	}
	if (setting.closepanelonclick.enabled){ //assign click behavior when panel content is clicked on (links within panel or elements with class "closepanel"
			ddpanel.addEvent(pcontent, function(e){
				var target=e.srcElement || e.target
				if (/(^|\s+)closepanel($|\s+)/.test(target.className) || target.tagName=="A" || (target.parentNode && target.parentNode.tagName=="A")){
					thispanel.togglepanel("up")
				}
			}, "click")
	}
},

uninit:function(){
	var setting=this.setting
	if (setting.stateconfig.persiststate){
		ddpanel.setCookie(setting.ids[0], setting.dir)
	}
	for (prop in setting){
		setting[prop]=null
	}
}



} //end of ddpanel object


//initialize instance of DD Drop Down Panel:

var defaultpanel=new ddpanel({
	ids: ["mypanel", "mypanelcontent", "mypaneltab"], // id of main panel DIV, content DIV, and tab DIV
	stateconfig: {initial: "0", persiststate: true}, // initial: initial reveal amount in pixels (ie: 5px)
	animate: {enabled: true, steps: 5}, //steps: number of animation steps. Int between 1-20. Smaller=faster.
	pointerimage: {enabled: true, src: ["images/facebook-icon.png", "images/arrow-up.jpg"]},
	closepanelonclick: {enabled: true} // close panel when links or elements with CSS class="closepanel" within container is clicked on?
})

//---------------end--------------
//Animated collapse DIV code below

var animatedcollapse={
divholders: {}, //structure: {div.id, div.attrs, div.$divref, div.$togglerimage}
divgroups: {}, //structure: {groupname.count, groupname.lastactivedivid}
lastactiveingroup: {}, //structure: {lastactivediv.id}
preloadimages: [],

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

addDiv:function(divid, attrstring){ //public function
	this.divholders[divid]=({id: divid, $divref: null, attrs: attrstring})
	this.divholders[divid].getAttr=function(name){ //assign getAttr() function to each divholder object
		var attr=new RegExp(name+"=([^,]+)", "i") //get name/value config pair (ie: width=400px,)
		return (attr.test(this.attrs) && parseInt(RegExp.$1)!=0)? RegExp.$1 : null //return value portion (string), or 0 (false) if none found
	}
	this.currentid=divid //keep track of current div object being manipulated (in the event of chaining)
	return this
},

showhide:function(divid, action){
	var $divref=this.divholders[divid].$divref //reference collapsible DIV
	if (this.divholders[divid] && $divref.length==1){ //if DIV exists
		var targetgroup=this.divgroups[$divref.attr('groupname')] //find out which group DIV belongs to (if any)
		if ($divref.attr('groupname') && targetgroup.count>1 && (action=="show" || action=="toggle" && $divref.css('display')=='none')){ //If current DIV belongs to a group
			if (targetgroup.lastactivedivid && targetgroup.lastactivedivid!=divid) //if last active DIV is set
				this.slideengine(targetgroup.lastactivedivid, 'hide') //hide last active DIV within group first
				this.slideengine(divid, 'show')
			targetgroup.lastactivedivid=divid //remember last active DIV
		}
		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] && $divref.length==1){ //if this DIV exists
		var animateSetting={height: action}
		if ($divref.attr('fade'))
			animateSetting.opacity=action
		$divref.animate(animateSetting, $divref.attr('speed')? parseInt($divref.attr('speed')) : 400, 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){ //do not generate name/value pair if value is null
			map[arguments[i][0]]=arguments[i][1]
		}
	}
	return map
},

init:function(){
	var ac=this
	jQuery(document).ready(function($){
		animatedcollapse.ontoggle=animatedcollapse.ontoggle || null
		var urlparamopenids=animatedcollapse.urlparamselect() //Get div ids that should be expanded based on the url (['div1','div2',etc])
		var persistopenids=ac.getCookie('acopendivids') //Get list of div ids that should be expanded due to persistence ('div1,div2,etc')
		var groupswithpersist=ac.getCookie('acgroupswithpersist') //Get list of group names that have 1 or more divs with "persist" attribute defined
		if (persistopenids!=null) //if cookie isn't null (is null if first time page loads, and cookie hasnt been set yet)
			persistopenids=(persistopenids=='nada')? [] : persistopenids.split(',') //if no divs are persisted, set to empty array, else, array of div ids
		groupswithpersist=(groupswithpersist==null || groupswithpersist=='nada')? [] : groupswithpersist.split(',') //Get list of groups with divs that are persisted
		jQuery.each(ac.divholders, function(){ //loop through each collapsible DIV object
			this.$divref=$('#'+this.id)
			if ((this.getAttr('persist') || jQuery.inArray(this.getAttr('group'), groupswithpersist)!=-1) && persistopenids!=null){ //if this div carries a user "persist" setting, or belong to a group with at least one div that does
				var cssdisplay=(jQuery.inArray(this.id, persistopenids)!=-1)? 'block' : 'none'
			}
			else{
				var cssdisplay=this.getAttr('hide')? 'none' : null
			}
			if (urlparamopenids[0]=="all" || jQuery.inArray(this.id, urlparamopenids)!=-1){ //if url parameter string contains the single array element "all", or this div's ID
				cssdisplay='block' //set div to "block", overriding any other setting
			}
			else if (urlparamopenids[0]=="none"){
				cssdisplay='none' //set div to "none", overriding any other setting
			}
			this.$divref.css(ac.generatemap(['height', this.getAttr('height')], ['display', cssdisplay]))
			this.$divref.attr(ac.generatemap(['groupname', this.getAttr('group')], ['fade', this.getAttr('fade')], ['speed', this.getAttr('speed')]))
			if (this.getAttr('group')){ //if this DIV has the "group" attr defined
				var targetgroup=ac.divgroups[this.getAttr('group')] || (ac.divgroups[this.getAttr('group')]={}) //Get settings for this group, or if it no settings exist yet, create blank object to store them in
				targetgroup.count=(targetgroup.count||0)+1 //count # of DIVs within this group
				if (jQuery.inArray(this.id, urlparamopenids)!=-1){ //if url parameter string contains this div's ID
					targetgroup.lastactivedivid=this.id //remember this DIV as the last "active" DIV (this DIV will be expanded). Overrides other settings
					targetgroup.overridepersist=1 //Indicate to override persisted div that would have been expanded
				}
				if (!targetgroup.lastactivedivid && this.$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]
		}
	}
}

}