Global Sort Order, Override?

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Hey guys, looking for a little programming help. I am trying to edit the forumdisplay.php to make all my forums/threads/etc show up alphabetical order, descending order (a,b,c,d,e,.,.,.).

I have located the code, just unsure what changes need to be made? There seems to be 2 different default sort options in the code?

PHP Code:

    // default sorting methods
    if (empty($sortfield))
    {
        $sortfield = $foruminfo['defaultsortfield']; <-- Edit?
    }
    if (empty($vbulletin->GPC['sortorder']))
    {
        $vbulletin->GPC['sortorder'] = $foruminfo['defaultsortorder'];  <-- Edit?
    }

    // look at sorting options:
    if ($vbulletin->GPC['sortorder'] != 'asc')
    {
        $sqlsortorder = 'DESC';
        $order = array('desc' => 'selected="selected"');
        $vbulletin->GPC['sortorder'] = 'desc';
    }
    else
    {
        $sqlsortorder = '';
        $order = array('asc' => 'selected="selected"');
    }

    switch ($sortfield)
    {
        case 'title':
            $sqlsortfield = 'thread.title';
            break;
        case 'lastpost':
            $sqlsortfield = 'lastpost';
            break;
        case 'replycount':
        case 'views':
        case 'postusername':
            $sqlsortfield = $sortfield;
            break;
        case 'voteavg':
            if ($foruminfo['allowratings'])
            {
                $sqlsortfield = 'voteavg';
                break;
            }
        case 'dateline':
            $sqlsortfield = 'thread.dateline';
            break;
        // else, use last post
        default:
            $handled = false;
            ($hook = vBulletinHook::fetch_hook('forumdisplay_sort')) ? eval($hook) : false;
            if (!$handled)
            {
                $sqlsortfield = 'lastpost';  <-- Edit?
                $sortfield = 'lastpost';  <-- Edit?
            } 


I think i need to change all or just one/two of the options highlighted, just unsure what to change them to? Any help would be appreciated.

I did a lot of experimentation buy I only got as far as sorting them in ascending order (backwards, e,d,c,b,a). I am a newb, forgive me.