public function getNavFormParams()
    {

        if (($sParams = $this->getViewConfigParam('navformparams')) === null) {
            $oStr = getStr();
            $sParams = '';
            $aNavParams = $this->getConfig()->getTopActiveView()->getNavigationParams();
            foreach ($aNavParams as $sName => $sValue) {
                if (isset($sValue)) {
                    $sParams .= "<input type=\"hidden\" name=\"{$sName}\" value=\"";
                    $sParams .= $oStr->htmlentities($sValue) . "\" />\n";
                }
            }
            $this->setViewConfigParam('navformparams', $sParams);
        }

        return $sParams;
    }