<table class="pnforum-border" cellpadding="5" cellspacing="0">

function pnForum_userapi_stickyunstickytopic($args)
{
    extract($args);
    unset($args);
 
    list($dbconn, $pntable) = pnfOpenDB();
 
    list($forum_id, $cat_id) = pnForum_userapi_get_forumid_and_categoryid_from_topicid(array('topic_id'=>$topic_id));
    if(!allowedtomoderatecategoryandforum($cat_id, $forum_id)) {
        return showforumerror(getforumerror('auth_mod',$forum_id, 'forum', _PNFORUM_NOAUTH_TOMODERATE), __file__, __line__);
    }
 
    $new_sticky = ($mode=="sticky") ? 1 : 0; 
 
    $sql = "UPDATE ".$pntable['pnforum_topics']." 
            SET sticky = '$new_sticky' 
            WHERE topic_id = '".(int)pnVarPrepForStore($topic_id)."'";
    
    $result = pnfExecuteSQL($dbconn, $sql, __file__, __line__);        
    pnfCloseDB($result); <<<----Esta es la linea q falla------->>>>>
    return;
}