public function checkPageSubjectInImageAltTags() {

        $html = $this->getPageContent();

        // for newly created page
        if ($html == '') {
            return false;
        }

        $dom = $this->createDOMDocumentFromHTML($html);

        $images = $dom->getElementsByTagName('img');

        foreach($images as $image){
            if($image->hasAttribute('alt') && $image->getAttribute('alt') != ''){
                if (preg_match('/' . preg_quote($this->owner->SEOPageSubject, '/') . '/i', $image->getAttribute('alt'))) {
                    return true;
                }
            }
        }

        return false;
    }