var ajaxtabssettings={}
ajaxtabssettings.bustcachevar=1  // Bust potential caching of external pages after initial request? (1=yes, 0=no).
ajaxtabssettings.loadstatustext="<img src='Images/loading_indicator.gif' /> Requesting content..." 

////NO NEED TO EDIT BELOW//////////////////////// 
function ajaxtabs(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" padding="0" frameborder="0" vspace="0" hspace="0" class="tabcontentiframe" style="width:725px; height:2010px"></iframe>'
	this.defaultIframe=this.defaultIframe.replace(/<iframe/i, '<iframe name="'+"_ajaxtabsiframe-"+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")
}

ajaxtabs.connect=function(pageurl, tabinstance){
	var page_request = false
	var bustcacheparameter=""
	if (window.XMLHttpRequest) // If Mozilla, IE7, Safari etc
		page_request = new XMLHttpRequest()
	else if (window.ActiveXObject){ // If IE6 or below
		try {
		page_request = new ActiveXObject("Msxml2.XMLHTTP")
		} 
		catch (e){
			try{
			page_request = new ActiveXObject("Microsoft.XMLHTTP")
			}
			catch (e){}
		}
	}
	else
		return false
	var ajaxfriendlyurl=pageurl.replace(/^http:\/\/[^\/]+\//i, "http://"+window.location.hostname+"/") 
	page_request.onreadystatechange=function(){ajaxtabs.loadpage(page_request, pageurl, tabinstance)}
	if (ajaxtabssettings.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)
}

ajaxtabs.loadpage=function(page_request, pageurl, tabinstance){
	var divId=tabinstance.contentdivid
	document.getElementById(divId).innerHTML=ajaxtabssettings.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
		ajaxtabs.ajaxpageloadaction(pageurl, tabinstance)
	}
}

ajaxtabs.ajaxpageloadaction=function(pageurl, tabinstance){
	tabinstance.onajaxpageload(pageurl) // Call user customized onajaxpageload() function when an ajax page is fetched/ loaded
}

ajaxtabs.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 ""
}

ajaxtabs.setCookie=function(name, value){
	document.cookie = name+"="+value+";path=/" // Cookie value is domain wide (path=/)
}

ajaxtabs.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")) // f 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
		ajaxtabs.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
	},

	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
			ajaxtabs.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
			ajaxtabs.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["_ajaxtabsiframe-"+contentdivid]!="undefined"){
			try{delete window.frames["_ajaxtabsiframe-"+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["_ajaxtabsiframe-"+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=ajaxtabs.getCookie(this.tabinterfaceid) // get position of persisted tab (applicable if persistence is enabled)
		var persisterror=true // Bool variable to check whether persisted tab position is valid (can become invalid if user has modified tab structure)
		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 (this.enabletabpersistence && parseInt(persistedtab)==i || !this.enabletabpersistence && this.getselectedClassTarget(this.tabs[i]).className=="selected"){
					this.expandtab(this.tabs[i]) // expand current tab if it's the persisted tab, or if persist=off, carries the "selected" CSS class
					persisterror=false // Persisted tab (if applicable) was found, so set "persisterror" to false
				}
			}
		} // END for loop
		if (persisterror) // if an error has occured while trying to retrieve persisted tab (based on its position within its peers)
			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