//*** 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);
        // hack - sometime a timeout of 1 happens before the page is rendered
        setTimeout('scroll(0,0)',1);
        setTimeout('scroll(0,0)',2);
        SetTabActive(FindEl('a',evt).semanticTab);
        scroll(0,0);
    }


    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);

        //Comment out the next line and include the file directly if you need IE5Mac or Opera7 support.
        AddStyleSheet('tabtastic.css',0);
    }
    Init();

},false);