//*** This library is copyright 2004 by Gavin Kistner, !@phrogz.net
//*** 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, '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);