//*** This code is copyright 2002-2003 by Gavin Kistner and Refinery; www.refinery.com
//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt

function AddClass(obj,cName){ KillClass(obj,cName); return obj && (obj.className+=(obj.className.length>0?' ':'')+cName); }

function KillClass(obj,cName){ return obj && (obj.className=obj.className.replace(new RegExp("^"+cName+"\\b\\s*|\\s*\\b"+cName+"\\b",'g'),'')); }

function HasClass(obj,cName){ return (!obj || !obj.className)?false:(new RegExp("\\b"+cName+"\\b")).test(obj.className) }

function AddStyleSheet(url,idx){
	var css,before=null,head=document.getElementsByTagName("head")[0];

	if (document.createElement){
		if (url){
			css = document.createElement('link');
			css.rel  = 'stylesheet';
			css.href = url;
		} else css = document.createElement('style');
		css.media = 'all';
		css.type  = 'text/css';

		if (idx>=0){
			for (var i=0,ct=0,len=head.childNodes.length;i<len;i++){
				var el = head.childNodes[i];
				if (!el.tagName) continue;
				var tagName = el.tagName.toLowerCase();
				if (ct==idx){
					before = el;
					break;
				}
				if (tagName=='style' || tagName=='link' && (el.rel && el.rel.toLowerCase()=='stylesheet' || el.type && el.type.toLowerCase()=='text/css') ) ct++;
			}
		}
		head.insertBefore(css,before);

		return document.styleSheets[before?idx:document.styleSheets.length-1];
	} else return alert("I can't create a new stylesheet for you. Sorry.");
}


function AddRule(ss,selector,styles){
	if (!ss) return false;
	if (ss.insertRule) return ss.insertRule(selector+' {'+styles+'}',ss.cssRules.length);
	if (ss.addRule){
		ss.addRule(selector,styles);
		return true;
	}
	return false;
}

function AttachEvent(obj,evt,fnc,useCapture){
	if (!useCapture) useCapture=false;
	if (obj.addEventListener){
		obj.addEventListener(evt,fnc,useCapture);
		return true;
	} else if (obj.attachEvent) return obj.attachEvent("on"+evt,fnc);
	else{
		MyAttachEvent(obj,evt,fnc);
		obj['on'+evt]=function(){ MyFireEvent(obj,evt) };
	}
} 

function MyAttachEvent(obj,evt,fnc){
	if (!obj.myEvents) obj.myEvents={};
	if (!obj.myEvents[evt]) obj.myEvents[evt]=[];
	var evts = obj.myEvents[evt];
	evts[evts.length]=fnc;
}
function MyFireEvent(obj,evt){
	if (!obj || !obj.myEvents || !obj.myEvents[evt]) return;
	var evts = obj.myEvents[evt];
	for (var i=0,len=evts.length;i<len;i++) evts[i]();
}

AttachEvent(window,'load',function(){
	var tocTag='ul',tocClass='tabset_tabs',tabTag='a',contentClass='tabset_content';


	function FindEl(tagName,evt){
		if (!evt && window.event) evt=event;
		if (!evt) return DebugOut("Can't find an event to handle in DLTabSet::SetTab",0);
		var el=evt.currentTarget || evt.srcElement;
		while (el && (!el.tagName || el.tagName.toLowerCase()!=tagName)) el=el.parentNode;
		return el;
	}

	function SetTabActive(tab){
		if (tab.tabTOC.activeTab){
			if (tab.tabTOC.activeTab==tab) return;
			KillClass(tab.tabTOC.activeTab,'active');
			if (tab.tabTOC.activeTab.tabContent) KillClass(tab.tabTOC.activeTab.tabContent,'tabset_content_active');
			
			if (tab.tabTOC.activeTab.prevTab) KillClass(tab.tabTOC.activeTab.previousTab,'preActive');
			if (tab.tabTOC.activeTab.nextTab) KillClass(tab.tabTOC.activeTab.nextTab,'postActive');
		}
		AddClass(tab.tabTOC.activeTab=tab,'active');
		if (tab.tabContent) AddClass(tab.tabContent,'tabset_content_active');				
		
		if (tab.prevTab) AddClass(tab.prevTab,'preActive');
		if (tab.nextTab) AddClass(tab.nextTab,'postActive');
	}
	function SetTabFromAnchor(evt){
		
		SetTabActive(FindEl('a',evt).semanticTab);
	}

	
	function Init(){
		window.everyTabThereIsById = {};
		
		var anchorMatch = /#([a-z][\w.:-]*)$/i,match;
		var activeTabs = [];
		
		var tocs = document.getElementsByTagName(tocTag);
		for (var i=0,len=tocs.length;i<len;i++){
			var toc = tocs[i];
			if (!HasClass(toc,tocClass)) continue;

			var lastTab;
			var tabs = toc.getElementsByTagName(tabTag);
			for (var j=0,len2=tabs.length;j<len2;j++){
				var tab = tabs[j];
				if (!tab.href || !(match=anchorMatch.exec(tab.href))) continue;
				if (lastTab){
					tab.prevTab=lastTab;
					lastTab.nextTab=tab;
				}
				tab.tabTOC=toc;
				everyTabThereIsById[tab.tabID=match[1]]=tab;
				tab.tabContent = document.getElementById(tab.tabID);
				
				if (HasClass(tab,'active')) activeTabs[activeTabs.length]=tab;
				
				lastTab=tab;
			}
			AddClass(toc.getElementsByTagName('li')[0],'firstchild');
		}

		for (var i=0,len=activeTabs.length;i<len;i++){
			SetTabActive(activeTabs[i]);
		}

		for (var i=0,len=document.links.length;i<len;i++){
			var a = document.links[i];
			if (!(match=anchorMatch.exec(a.href))) continue;
			if (a.semanticTab = everyTabThereIsById[match[1]]) AttachEvent(a,'click',SetTabFromAnchor,false);
		}
		
		if ((match=anchorMatch.exec(location.href)) && (a=everyTabThereIsById[match[1]])) SetTabActive(a);
		
		AddStyleSheet('tabtastic.css',0);
	}
	Init();
},false);