Trying to add “Previous pages” and “next pages”

Hi,

I’ve just installed October Special theme for WordPress and i’ve seen a strange thing that i can’t arrange! I can add at the end of the pages the “Previous pages” but it’s imposible!!! please!!

The theme has two strange pages, home.php and index.php, i paste the code.

index.php

<?php get_header(); ?>
<div id="content_wrapper">
	<div id="content_inner" class="clearfix">
		<div class="content_left">
			<?php if (have_posts()) : ?>
			<?php while (have_posts()) : the_post(); ?>
				<div class="post" id="post-<?php the_ID(); ?>">
					<div class="post_date">

					<?php the_time('j \d\e F \d\e Y') ?><br />
				Categoría: <?php the_category(', ') ?><br />
<?php the_tags('Etiquetas: ',' , '); ?><br />
					<?php comments_popup_link('No hay comentarios', 'Un comentario', '% comentarios'); ?>
					</div>
					<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
					<div class="entry">
					<?php the_content_rss('', TRUE, '', 50); ?>

					</div>
				<div class="clear"></div>

                               </div>

			<?php endwhile; ?>
			<?php else : ?>
			<div class="post" id="post-<?php the_ID(); ?>">
				<h2>No hay nada aquí</h2>
				<div class="entry">
					<p>En esta página no hay nada, lo siento. Vuelve atrás y sigue disfrutando de este blog.</p>

				</div>
			<div class="clear"></div>
			</div>
			<?php endif; ?>
			<br />

			<div class="nextprevious">
				<div class="left"><?php next_posts_link('&laquo; Anteriores') ?></div>
				<div class="right"><?php previous_posts_link('Siguientes &raquo;') ?></div>
			</div>
			<div class="clear"></div>
		</div>
		<div class="content_right">
			<?php include (TEMPLATEPATH . '/main_right.php'); ?>
		</div>
		<div class="clear"></div>
	</div>
</div>
<div id="bottom_wrapper">
	<div id="bottom_inner" class="clearfix">
		<div class="bottom_left">
		<?php include (TEMPLATEPATH . '/bottom_posts.php'); ?>
		</div>
		<?php include (TEMPLATEPATH . '/bottom_right.php'); ?>
		<div class="clear"></div>
	<div id="categories">
		<h3>Categorías</h3>
		<ul>
			<?php wp_list_cats('sort_column=name&optioncount=0'); ?>
		</ul>
	</div>
	</div>
</div>
<?php get_footer(); ?>

and home.php, what I think that shows when I enter my page. See the strange thing that does with that <?php $top_query = new WP_Query(‘showposts=8’); ?>

<?php get_header(); ?>

<div id="content_wrapper">

	<div id="content_inner" class="clearfix">

		<div class="content_left">

		<?php $top_query = new WP_Query('showposts=8'); ?>
		<?php while($top_query->have_posts()) : $top_query->the_post(); $first_post = $post->ID; ?>
			<div class="post" id="post-<?php the_ID(); ?>">
				<div class="post_date">
                                <?php PSR_show_voting_stars(); ?>
				<?php the_time('j \d\e F \d\e Y') ?><br />
				Categoría: <?php the_category(', ') ?><br />
<?php the_tags('Etiquetas: ',' , '); ?>
     <?php if(function_exists('the_ratings')) { the_ratings(); } ?>
					<div class="extra_status">
					<?php comments_popup_link('No hay comentarios', 'Un comentario', '% comentarios'); ?>
					</div>
				</div>
				<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a></h2>
					<div class="entry">
					<?php the_content('[Sigue leyendo...]'); ?>
					</div>

					<div class="clear"></div>

			</div>

		<?php endwhile; ?>

		</div>

		<div class="content_right">
		<?php include (TEMPLATEPATH . '/main_right.php'); ?>
		</div>
	</div>

</div>
<div id="bottom_wrapper">
	<div id="bottom_inner" class="clearfix">
		<div class="bottom_left">

		</div>
		<?php include (TEMPLATEPATH . '/bottom_right.php'); ?>
		<div class="clear"></div>
	<div id="categories">
		<h3>Categorías</h3>
		<ul>
		<?php wp_list_cats('sort_column=name&optioncount=0'); ?>
		</ul>
	</div>
	</div>
</div>
<?php get_footer(); ?>