public function getMyAliasNbPages()
    {
        if ($this->_myLastPageGroupNb == 0) {
            return $this->getAliasNbPages();
        } else {
            $old = $this->currpagegroup;
            $this->currpagegroup = '{nb'.$this->_myLastPageGroupNb.'}';
            $new = $this->getPageGroupAlias();
            $this->currpagegroup = $old;

            return $new;
        }
    }