Next Previous post links for current category only

Hi All

I obtained this code from wpsites.net which added the Next/Previous Post links.

add_action( 'genesis_entry_content', 'custom_single_post_nav', 12 );
function custom_single_post_nav() {

	if ( ! is_singular( 'post' ) )
		return;

	echo '<div class="pagination-previous alignleft">';
	previous_post_link('%link', 'Previous Post', FALSE);
	echo '</div>';

	echo '<div class="pagination-next alignright">';
	next_post_link('%link', 'Next Post', FALSE);
	echo '</div>';

}

Is there a function I can add that will display the link for the next or previous post in the same category please?

Thanks

Rich

The page I need help with: [log in to see the link]