Previous Next Navigation for Custom Post Types

Code for Previous Next Navigation for Custom Post Types.
This code will display the name of the previous or next post.

<?php if( is_singular('lesson') ) { ?>
<div class="post-nav">
<div class="alignleft prev-next-post-nav"><?php previous_post_link( '&laquo; %link' ) ?></div>
<div class="alignright prev-next-post-nav"><?php next_post_link( '%link &raquo;' ) ?></div>
</div><?php } ?>

This code will display the words Previous and Next

<?php if( is_singular('lesson') ) { ?>
<div class="post-nav">
<div class="alignleft prev-next-post-nav"><?php previous_post_link( '%link', 'Previous' ) ?></div>
<div class="alignright prev-next-post-nav"><?php next_post_link( '%link', 'Next' ) ?></div>
</div><?php } ?>