/**
         * return an array with all needed data to create the navigation
         * for changing pages by back/next or page-number.
         */
        function get_gbNav($full=false)
        {
            // rückgabearray initialisieren.
            $ret = array();

            // sicherstellen, dass es auch zahlen sind.
            $this->setvalue('start', (int)$this->getvalue('start'));
            $this->setvalue('limit', (int)$this->getvalue('limit'));
            $this->setvalue('posts', (int)$this->getvalue('posts'));

            // anzahl der seiten und aktuelle seite ermitteln
            $this->setvalue('allpages', ceil($this->getvalue('posts')/$this->getvalue('limit')));
            $this->setvalue('actpage',  ceil($this->getvalue('start')/$this->getvalue('limit')+1));

            // back/next link errechnen
            $back = (($this->getvalue('start') - $this->getvalue('limit')) > -1 )                       ? ($this->getvalue('start') - $this->getvalue('limit')) : '';
            $next = (($this->getvalue('start') + $this->getvalue('limit')) < $this->getvalue('posts') ) ? ($this->getvalue('start') + $this->getvalue('limit')) : '';

            // back-link
            $ret[] = array('text' => 'back', 'start' => $back);

            // wenn eine komplette darstellung incl. seitenzahlen gewüscht ist.

            switch ($this->getvalue('navtype'))
            {
                case 'comfort': $start = max(1, ($this->getvalue('actpage') - floor($this->getvalue('display')/2)) );
                                $start = min($start, ($this->getvalue('allpages') - $this->getvalue('display')+1) );
                                $start = ($start < 1) ? 1 : $start;
                                $ende  = min($start+$this->getvalue('display')-1, $this->getvalue('allpages') );

                                for ($i=$start;$i<=$ende;$i++)
                                {
                                    $pagestart = ($i-1) * $this->getvalue('limit');
                                    $ret[] = array( 'text'  => $i,
                                                    'start' => (($pagestart!=$this->getvalue('start')) ? (int)$pagestart : (string)'')
                                             );
                                }
                                break;

                case 'normal':  for ($i=1;$i<=$this->getvalue('allpages');$i++)
                                {
                                    $pagestart = ($i-1) * $this->getvalue('limit');
                                    $ret[] = array( 'text'  => $i,
                                                    'start' => (($pagestart!=$this->getvalue('start')) ? (int)$pagestart : (string)'')
                                             );
                                }
                                break;

                default:
            }

            // next-link
            $ret[] = array('text' => 'next', 'start' => $next);


            if ($this->getvalue('navtype')=='comfort')
            {
                $ret[] = array( 'text'  => 'last',
                                'start' => (($this->getvalue('actpage')!=$this->getvalue('allpages')) ? (int)($this->getvalue('allpages')*$this->getvalue('limit')-$this->getvalue('limit')) : (string)'')
                         );

                array_unshift($ret, array( 'text'  => 'first',
                                           'start' => (($this->getvalue('actpage')!=1) ? (int)0 : (string)'')
                                    ));
            }

            // rückgabe
            return $ret;
        }