How to Next and previous post images

How to Next and previous post images
Adding this PHP code to your wordpress theme will display image links for your next and previous posts. Upload images to your theme with the name next.png and prev.png.

<?php
           next_post_link( '%link', '<img src="' . get_bloginfo('stylesheet_directory') . '/img/prev.png" />');
?>
<?php
           previous_post_link('%link', '<img src="' . get_bloginfo('stylesheet_directory') . '/img/next.png" />' );
 ?>