Post Navigation Twentyeleven

Hi,
I’m having trouble getting this to work with my child theme of twentyeleven. Single posts are working fine but my latest posts and archive pages are not working.

I tried following the documentation and added the supplied javascript to add the rel attribute, (modified slightly for my selectors) but it still doesn’t work.

functions.php

function wpb_hook_javascript() {
    ?>
        <script>
			// Runs on page load, the initial post.
			jQuery( document ).ready( function() {
    			jQuery( 'div.nav-previous' ).find( 'a' ).attr( 'rel', 'prev' );
			});

			// Runs once a post has loaded.
			jQuery('body').on( 'alnp-post-loaded', function( e ) {
    			jQuery( 'div.nav-previous' ).find( 'a' ).attr( 'rel', 'prev' );
			});
        </script>
    <?php
}
add_action('wp_head', 'wpb_hook_javascript');

This appears to add the relattribute as intended but auto scroll is still not working.

I’m hoping I am just misunderstanding something simple.
Any help is most appreciated.

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