function tab_news(tab_news_name){
	this.tab_news_name=tab_news_name //ID of Tab Menu main container
	this.all_tab_anchor=document.getElementById(tab_news_name).getElementsByTagName("a") //Get all tab links within container
	this.enabletabpersis_news=true
	this.current_tabspo=[] //Array to store position of tabs that have a "rel" attr defined, relative to all tab links, within container
	this.subcontent_ids=[] //Array to store ids of the sub contents ("rel" attr values)
	this.revcontent_ids=[] //Array to store ids of arbitrary contents to expand/contact as well ("rev" attr values)
	this.selectedClass_Target="link" //keyword to indicate which target element to assign "selected" CSS class ("linkparent" or "link")
}

tab_news.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 ""
}

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

tab_news.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.all_tab_anchor[tabid_or_position].getAttribute("rel")) //if specified tab contains "rel" attr
				tabref=this.all_tab_anchor[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
	},

	set_persist:function(bool){ //PUBLIC function to toggle persistence feature
			this.enabletabpersis_news=bool
	},

	setselected_ClassTarget:function(objstr){ //PUBLIC function to set which target element to assign "selected" CSS class ("linkparent" or "link")
		this.selectedClass_Target=objstr || "link"
	},

	getselectedClassTarget:function(tabref){ //Returns target element to assign "selected" CSS class to
		return (this.selectedClass_Target==("linkparent".toLowerCase()))? tabref.parentNode : tabref
	},

	expandtab:function(tabref){
		var subcontentid=tabref.getAttribute("rel") //Get id of subcontent to expand
		if(subcontentid == 'LOC' || subcontentid == 'ENT' || subcontentid == 'IT' || subcontentid == 'SPO'){
			//Set the Current Tab Name to the AJAX Function
			if (document.getElementById('xmlLoad'+subcontentid).value == 0) {
				read_xml_tab(document.getElementById('current_tab').value,subcontentid);
				document.getElementById('NewsLoadingMsg').style.display = "block";
			}
			if (parseInt(document.getElementById('xmlLoad'+subcontentid).value)!= 0) {
				document.getElementById('NewsLoadingMsg').style.display = "none";
			}
		}else{
			document.getElementById('NewsLoadingMsg').style.display = "none";
		}
		//Get "rev" attr as a string of IDs in the format ",john,george,trey,etc," to easily search through
		var associatedrevids=(tabref.getAttribute("rev"))? ","+tabref.getAttribute("rev").replace(/\s+/, "")+"," : ""
		this.expandsubcontent(subcontentid)
		this.expandrevcontent(associatedrevids)
		for (var i=0; i<this.all_tab_anchor.length; i++){ //Loop through all tabs, and assign only the selected tab the CSS class "selected"
			this.getselectedClassTarget(this.all_tab_anchor[i]).className=(this.all_tab_anchor[i].getAttribute("rel")==subcontentid)? "selected" : ""
		}
		if (this.enabletabpersis_news) //if persistence enabled, save selected tab position(int) relative to its peers
			tab_news.setCookie(this.tab_news_name, tabref.tabposition)
	},

	expandsubcontent:function(subcontentid){
		for (var i=0; i<this.subcontent_ids.length; i++){
			var subcontent=document.getElementById(this.subcontent_ids[i]) //cache current subcontent obj (in for loop)
			subcontent.style.display=(subcontent.id==subcontentid)? "block" : "none" //"show" or hide sub content based on matching id attr value
		}
	},


	expandrevcontent:function(associatedrevids){
		var allrevids=this.revcontent_ids
		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"
		}
	},

	autorun:function(){ //function to auto cycle through and select tabs based on a set interval
		var currentTabIndex=this.automode_currentTabIndex //index within this.hottabspositions to begin
		var current_tabspo=this.current_tabspo //Array containing position numbers of "hot" tabs (those with a "rel" attr)
		this.expandtab(this.all_tab_anchor[current_tabspo[currentTabIndex]])
		this.automode_currentTabIndex=(currentTabIndex<current_tabspo.length-1)? currentTabIndex+1 : 0 //increment currentTabIndex
	},

	cancelautorun:function(){
		if (typeof this.autoruntimer!="undefined")
			clearInterval(this.autoruntimer)
	},

	tab_init:function(automodeperiod){
		var persistedtab=tab_news.getCookie(this.tab_news_name) //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
		for (var i=0; i<this.all_tab_anchor.length; i++){
			this.all_tab_anchor[i].tabposition=i //remember position of tab relative to its peers
			if (this.all_tab_anchor[i].getAttribute("rel")){
				var tabinstance=this
				this.current_tabspo[this.current_tabspo.length]=i //store position of "hot" tab ("rel" attr defined) relative to its peers
				this.subcontent_ids[this.subcontent_ids.length]=this.all_tab_anchor[i].getAttribute("rel") //store id of sub content ("rel" attr value)
				this.all_tab_anchor[i].onclick=function(){
					tabinstance.expandtab(this)
					tabinstance.cancelautorun() //stop auto cycling of tabs (if running)
					return false
				}
				if (this.all_tab_anchor[i].getAttribute("rev")){ //if "rev" attr defined, store each value within "rev" as an array element
					this.revcontent_ids=this.revcontent_ids.concat(this.all_tab_anchor[i].getAttribute("rev").split(/\s*,\s*/))
				}
				if (this.enabletabpersis_news && parseInt(persistedtab)==i || !this.enabletabpersis_news && this.getselectedClassTarget(this.all_tab_anchor[i]).className=="selected"){
					this.expandtab(this.all_tab_anchor[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
					//If currently selected tab's index(i) is greater than 0, this means its not the 1st tab, so set the tab to begin in automode to 1st tab:
					this.automode_currentTabIndex=(i>0)? 0 : 1
				}
			}
		} //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.all_tab_anchor[this.current_tabspo[0]]) //Just select first tab that contains a "rel" attr
		if (parseInt(this.automodeperiod)>500 && this.current_tabspo.length>1){
			this.automode_currentTabIndex=this.automode_currentTabIndex || 0
			this.autoruntimer=setInterval(function(){tabinstance.autorun()}, this.automodeperiod)
		}
	} //END int() function

} //END Prototype assignment