//*** This library is copyright 2004 by Gavin Kistner, gavin@refinery.com
//*** It is covered under the license viewable at http://phrogz.net/JS/_ReuseLicense.txt
//*** Reuse or modification is free provided you abide by the terms of that license.
//*** (Including the first two lines above in your source code mostly satisfies the conditions.)

//*** Tabtastic -- see http://phrogz.net/JS/Tabstatic/index.html
//*** Version 1.0    20040430   Initial release.
//***         1.0.2  20040501   IE5Mac, IE6Win compat.
//***         1.0.3  20040501   Removed IE5Mac/Opera7 compat. (see http://phrogz.net/JS/Tabstatic/index.html#notes)
//***         1.0.4  20040521   Added scroll-back hack to prevent scrolling down to page anchor. Then commented out :)

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.tabContent) tab.tabTOC.activeTab.tabContent.style.display='';
                        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.tabContent) tab.tabContent.style.display='block';
                if (tab.prevTab) AddClass(tab.prevTab,'preActive');
                if (tab.nextTab) AddClass(tab.nextTab,'postActive');
        }
        function SetTabFromAnchor(evt){
                //setTimeout('document.body.scrollTop='+document.body.scrollTop,1);
                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,'mouseover',SetTabFromAnchor,false);
                }
                
                if ((match=anchorMatch.exec(location.href)) && (a=everyTabThereIsById[match[1]])) SetTabActive(a);
                
                //Comment out the next line and include the file directly if you need IE5Mac or Opera7 support.
                AddStyleSheet('TabWidget.css',0);
        }
        Init();
},false);