Show next and previous page number

How about using the built-in function?

<?php
previous_post_link( '%link', '' . _x( '&larr;', 'Previous post link', 'twentyten' ) . ' %title' );
next_post_link( '%link', '%title ' . _x( '&rarr;', 'Next post link', 'twentyten' ) . '' );
?>

More information on pagination is available here:

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