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var ddajaxtabssettings={}

ddajaxtabssettings.bustcachevar=0  //bust potential caching of external pages after initial request? (1=yes, 0=no)

ddajaxtabssettings.loadstatustext="<br><img src='layout/loading.gif'/>" 







////NO NEED TO EDIT BELOW////////////////////////



function ddajaxtabs(tabinterfaceid, contentdivid){

	this.tabinterfaceid=tabinterfaceid //ID of Tab Menu main container

	this.tabs=document.getElementById(tabinterfaceid).getElementsByTagName("a") //Get all tab links within container

	this.enabletabpersistence=true

	this.hottabspositions=[] //Array to store position of tabs that have a "rel" attr defined, relative to all tab links, within container

	this.currentTabIndex=0 //Index of currently selected hot tab (tab with sub content) within hottabspositions[] array

	this.contentdivid=contentdivid

	this.defaultHTML=""

	this.defaultIframe='<iframe src="about:blank" marginwidth="0" marginheight="0" frameborder="0" vspace="0" hspace="0" class="tabcontentiframe" style="width:100%; height:auto; min-height: 100px"></iframe>'

	this.defaultIframe=this.defaultIframe.replace(/<iframe/i, '<iframe name="'+"_ddajaxtabsiframe-"+contentdivid+'" ')

this.revcontentids=[] //Array to store ids of arbitrary contents to expand/contact as well ("rev" attr values)

	this.selectedClassTarget="link" //keyword to indicate which target element to assign "selected" CSS class ("linkparent" or "link")

}



ddajaxtabs.connect=function(pageurl, tabinstance){

	var page_request = false

	var bustcacheparameter=""

	if (window.ActiveXObject){ //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)

		try {

		page_request = new ActiveXObject("Msxml2.XMLHTTP")

		} 

		catch (e){

			try{

			page_request = new ActiveXObject("Microsoft.XMLHTTP")

			}

			catch (e){}

		}

	}

	else if (window.XMLHttpRequest) // if Mozilla, Safari etc

		page_request = new XMLHttpRequest()

	else

		return false

	var ajaxfriendlyurl=pageurl.replace(/^http:\/\/[^\/]+\//i, "http://"+window.location.hostname+"/") 

	page_request.onreadystatechange=function(){ddajaxtabs.loadpage(page_request, pageurl, tabinstance)}

	if (ddajaxtabssettings.bustcachevar) //if bust caching of external page

		bustcacheparameter=(ajaxfriendlyurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()

	page_request.open('GET', ajaxfriendlyurl+bustcacheparameter, true)

	page_request.send(null)

}



ddajaxtabs.loadpage=function(page_request, pageurl, tabinstance){

	var divId=tabinstance.contentdivid

	document.getElementById(divId).innerHTML=ddajaxtabssettings.loadstatustext //Display "fetching page message"

	if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){

		document.getElementById(divId).innerHTML=page_request.responseText

		ddajaxtabs.ajaxpageloadaction(pageurl, tabinstance)

	}

}



ddajaxtabs.ajaxpageloadaction=function(pageurl, tabinstance){

	tabinstance.onajaxpageload(pageurl) //call user customized onajaxpageload() function when an ajax page is fetched/ loaded

}



ddajaxtabs.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 ""

}



ddajaxtabs.setCookie=function(name, value){

	document.cookie = name+"="+value+";path=/" //cookie value is domain wide (path=/)

}



ddajaxtabs.prototype={



	expandit:function(tabid_or_position){ //PUBLIC function to select a tab either by its ID or position(int) within its peers

		this.cancelautorun() //stop auto cycling of tabs (if running)

		var tabref=""

		try{

			if (typeof tabid_or_position=="string" && document.getElementById(tabid_or_position).getAttribute("rel")) //if specified tab contains "rel" attr

				tabref=document.getElementById(tabid_or_position)

			else if (parseInt(tabid_or_position)!=NaN && this.tabs[tabid_or_position].getAttribute("rel")) //if specified tab contains "rel" attr

				tabref=this.tabs[tabid_or_position]

		}

		catch(err){alert("Invalid Tab ID or position entered!")}

		if (tabref!="") //if a valid tab is found based on function parameter

			this.expandtab(tabref) //expand this tab

	},



	cycleit:function(dir, autorun){ //PUBLIC function to move foward or backwards through each hot tab (tabinstance.cycleit('foward/back') )

		if (dir=="next"){

			var currentTabIndex=(this.currentTabIndex<this.hottabspositions.length-1)? this.currentTabIndex+1 : 0

		}

		else if (dir=="prev"){

			var currentTabIndex=(this.currentTabIndex>0)? this.currentTabIndex-1 : this.hottabspositions.length-1

		}

		if (typeof autorun=="undefined") //if cycleit() is being called by user, versus autorun() function

			this.cancelautorun() //stop auto cycling of tabs (if running)

		this.expandtab(this.tabs[this.hottabspositions[currentTabIndex]])

	},



	setpersist:function(bool){ //PUBLIC function to toggle persistence feature

			this.enabletabpersistence=bool

	},



	loadajaxpage:function(pageurl){ //PUBLIC function to fetch a page via Ajax and display it within the Tab Content instance's container

		ddajaxtabs.connect(pageurl, this)

	},



	loadiframepage:function(pageurl){ //PUBLIC function to fetch a page and load it into the IFRAME of the Tab Content instance's container

		this.iframedisplay(pageurl, this.contentdivid)

	},



	setselectedClassTarget:function(objstr){ //PUBLIC function to set which target element to assign "selected" CSS class ("linkparent" or "link")

		this.selectedClassTarget=objstr || "link"

	},



	getselectedClassTarget:function(tabref){ //Returns target element to assign "selected" CSS class to

		return (this.selectedClassTarget==("linkparent".toLowerCase()))? tabref.parentNode : tabref

	},



	urlparamselect:function(tabinterfaceid){

		var result=window.location.search.match(new RegExp(tabinterfaceid+"=(\\d+)", "i")) //check for "?tabinterfaceid=2" in URL

		return (result==null)? null : parseInt(RegExp.$1) //returns null or index, where index (int) is the selected tab's index

	},



	onajaxpageload:function(pageurl){ //PUBLIC Event handler that can invoke custom code whenever an Ajax page has been fetched and displayed

		//do nothing by default

	},



	expandtab:function(tabref){

		var relattrvalue=tabref.getAttribute("rel")

		//Get "rev" attr as a string of IDs in the format ",john,george,trey,etc," to easy searching through

		var associatedrevids=(tabref.getAttribute("rev"))? ","+tabref.getAttribute("rev").replace(/\s+/, "")+"," : ""

		if (relattrvalue=="#default")

			document.getElementById(this.contentdivid).innerHTML=this.defaultHTML

		else if (relattrvalue=="#iframe")

			this.iframedisplay(tabref.getAttribute("href"), this.contentdivid)

		else

			ddajaxtabs.connect(tabref.getAttribute("href"), this)

		this.expandrevcontent(associatedrevids)

		for (var i=0; i<this.tabs.length; i++){ //Loop through all tabs, and assign only the selected tab the CSS class "selected"

			this.getselectedClassTarget(this.tabs[i]).className=(this.tabs[i].getAttribute("href")==tabref.getAttribute("href"))? "selected" : ""

		}

		if (this.enabletabpersistence) //if persistence enabled, save selected tab position(int) relative to its peers

			ddajaxtabs.setCookie(this.tabinterfaceid, tabref.tabposition)

		this.setcurrenttabindex(tabref.tabposition) //remember position of selected tab within hottabspositions[] array

	},



	iframedisplay:function(pageurl, contentdivid){

		if (typeof window.frames["_ddajaxtabsiframe-"+contentdivid]!="undefined"){

			try{delete window.frames["_ddajaxtabsiframe-"+contentdivid]} //delete iframe within Tab content container if it exists (due to bug in Firefox)

			catch(err){}

		}

		document.getElementById(contentdivid).innerHTML=this.defaultIframe

		window.frames["_ddajaxtabsiframe-"+contentdivid].location.replace(pageurl) //load desired page into iframe

	},





	expandrevcontent:function(associatedrevids){

		var allrevids=this.revcontentids

		for (var i=0; i<allrevids.length; i++){ //Loop through rev attributes for all tabs in this tab interface

			//if any values stored within associatedrevids matches one within allrevids, expand that DIV, otherwise, contract it

			document.getElementById(allrevids[i]).style.display=(associatedrevids.indexOf(","+allrevids[i]+",")!=-1)? "block" : "none"

		}

	},



	setcurrenttabindex:function(tabposition){ //store current position of tab (within hottabspositions[] array)

		for (var i=0; i<this.hottabspositions.length; i++){

			if (tabposition==this.hottabspositions[i]){

				this.currentTabIndex=i

				break

			}

		}

	},



	autorun:function(){ //function to auto cycle through and select tabs based on a set interval

		this.cycleit('next', true)

	},



	cancelautorun:function(){

		if (typeof this.autoruntimer!="undefined")

			clearInterval(this.autoruntimer)

	},



	init:function(automodeperiod){

		var persistedtab=ddajaxtabs.getCookie(this.tabinterfaceid) //get position of persisted tab (applicable if persistence is enabled)

		var selectedtab=-1 //Currently selected tab index (-1 meaning none)

		var selectedtabfromurl=this.urlparamselect(this.tabinterfaceid) //returns null or index from: tabcontent.htm?tabinterfaceid=index

		this.automodeperiod=automodeperiod || 0

		this.defaultHTML=document.getElementById(this.contentdivid).innerHTML

		for (var i=0; i<this.tabs.length; i++){

			this.tabs[i].tabposition=i //remember position of tab relative to its peers

			if (this.tabs[i].getAttribute("rel")){

				var tabinstance=this

				this.hottabspositions[this.hottabspositions.length]=i //store position of "hot" tab ("rel" attr defined) relative to its peers

				this.tabs[i].onclick=function(){

					tabinstance.expandtab(this)

					tabinstance.cancelautorun() //stop auto cycling of tabs (if running)

					return false

				}

				if (this.tabs[i].getAttribute("rev")){ //if "rev" attr defined, store each value within "rev" as an array element

					this.revcontentids=this.revcontentids.concat(this.tabs[i].getAttribute("rev").split(/\s*,\s*/))

				}

				if (selectedtabfromurl==i || this.enabletabpersistence && selectedtab==-1 && parseInt(persistedtab)==i || !this.enabletabpersistence && selectedtab==-1 && this.getselectedClassTarget(this.tabs[i]).className=="selected"){

					selectedtab=i //Selected tab index, if found

				}

			}

		} //END for loop

		if (selectedtab!=-1) //if a valid default selected tab index is found

			this.expandtab(this.tabs[selectedtab]) //expand selected tab (either from URL parameter, persistent feature, or class="selected" class)

		else //if no valid default selected index found

			this.expandtab(this.tabs[this.hottabspositions[0]]) //Just select first tab that contains a "rel" attr

		if (parseInt(this.automodeperiod)>500 && this.hottabspositions.length>1){

			this.autoruntimer=setInterval(function(){tabinstance.autorun()}, this.automodeperiod)

		}

	} //END int() function



} //END Prototype assignment