//** Tab Content script v2.0- © Dynamic Drive DHTML code library (http://www.dynamicdrive.com)
//** Updated Oct 7th, 07 to version 2.0. Contains numerous improvements:
//   -Added Auto Mode: Script auto rotates the tabs based on an interval, until a tab is explicitly selected
//   -Ability to expand/contract arbitrary DIVs on the page as the tabbed content is expanded/ contracted
//   -Ability to dynamically select a tab either based on its position within its peers, or its ID attribute (give the target tab one 1st)
//   -Ability to set where the CSS classname "selected" get assigned- either to the target tab's link ("A"), or its parent container
//** Updated Feb 18th, 08 to version 2.1: Adds a "tabinstance.cycleit(dir)" method to cycle forward or backward between tabs dynamically
//** Updated April 8th, 08 to version 2.2: Adds support for expanding a tab using a URL parameter (ie: http://mysite.com/tabcontent.htm?tabinterfaceid=0) 

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

function ddtabcontent(tabinterfaceid) {
	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.subcontentids = [] //Array to store ids of the sub contents ("rel" attr values)
	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")
}

ddtabcontent.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 ""
}

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

ddtabcontent.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
	},

	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
	},

	expandtab: function(tabref) {
		var subcontentid = tabref.getAttribute("rel") //Get id of subcontent to expand
		//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.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("rel") == subcontentid) ? "selected" : ""
		}
		if (this.enabletabpersistence) //if persistence enabled, save selected tab position(int) relative to its peers
			ddtabcontent.setCookie(this.tabinterfaceid, tabref.tabposition)
		this.setcurrenttabindex(tabref.tabposition) //remember position of selected tab within hottabspositions[] array
	},

	expandsubcontent: function(subcontentid) {
		for (var i = 0; i < this.subcontentids.length; i++) {
			var subcontent = document.getElementById(this.subcontentids[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.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 = ddtabcontent.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
		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.subcontentids[this.subcontentids.length] = this.tabs[i].getAttribute("rel") //store id of sub content ("rel" attr value)
				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