//weight keywords
        $_k = explode('+',$keywords);

        $weight = count($_k);
        $words = array();
        $words2 = array();

        foreach ($_k as $word)
        {
            $words[] = urlencode($word.'^'.$weight);
            $words2[] = urlencode($word.'^'.$weight*0.5);
            $weight--;
        }

        $keywords = 'title:'.implode('+',$words2).'+allFields:'.implode('+',$words);

        $client->setUri($this->_buildUri($keywords));