wordpress -- add previous next links to archive

I want to add previous/next links to an archive template.

Here is the code I have for the function in the category.php page.  A sample archive on the site is http://southnyack.ny.gov/category/mayors-update/.

function custom_tax_group() {  
    $term = get_term_by('id', get_query_var('cat'), 'category');
    $count = 0;
    $cat_name = get_cat_name( $term->term_id );
    $the_query = new WP_Query('cat='.$term->term_id);
    $left = $the_query->post_count % 2 == 0 ? -1 : $the_query->post_count;

    if ($the_query->have_posts()) {
    		echo '<h2>' . $cat_name . '</h2>';

        ?>

        <table width="100%">

            <tbody>

            <?php

            while($the_query->have_posts()){

                $the_query->the_post();

                if($count == 0){

                    echo '<tr>';

                }

                $image =  wp_get_attachment_image_src(get_post_thumbnail_id(get_the_ID()),'thumbnail');

                ?>

                <td>

                    <a href="<?=get_the_permalink();?>"><?=get_the_title();?></a>

                    <p><?=get_the_excerpt();?></p>

                </td>

                <?php

                $count++;

                if($count == 2 || ($left == 0)){

                    echo '</tr>';

                    $count = 0;

                }

                if($left > -1){

                    $left--;

                }

            }
            ?>
            </tbody>
        </table>
        <?php
        //echo '&nbsp;<a class="more-link" href="' . get_permalink() . '" rel="nofollow">Read More &hellip;</a>';
    }
}

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