work on some pages and some not

i didn’t look on other notes tab…
in the page type that its didnt work there is <img> and in the page that its work there is the_post_thumbnail…
after i added :
<?php
$img_html = ‘<img src=”myimage.jpg” alt=””>’;
$img_html = apply_filters( ‘bj_lazy_load_html’, $img_html );
echo $img_html;
?>
its work ??
thanks for great plugin!