Previous posts link

Hi. This has already been discussed here. I’m using this theme layout, and when I try to display the “Next and Previous posts link”, it just doesn’t show. I’m sure I followed everything said in that post, but I don’t understand PHP, so I don’t know how to solve it.

Here is the code for the index.php and the home.php files:

index.php:

<?php get_header(); ?>

		<!-- begin colLeft -->
		<div id="colLeft">
        <!-- begin colLeftInner -->
        <div id="colLeftInner" class="clearfix">
		<!-- archive-title -->
						<?php if(is_month()) { ?>
						<div id="archive-title">
						Browsing articles from "<strong><?php the_time('F, Y') ?></strong>"
						</div>
						<?php } ?>
						<?php if(is_category()) { ?>
						<div id="archive-title">
						Browsing articles in "<strong><?php $current_category = single_cat_title("", true); ?></strong>"
						</div>
						<?php } ?>
						<?php if(is_tag()) { ?>
						<div id="archive-title">
						Browsing articles tagged with "<strong><?php wp_title('',true,''); ?></strong>"
						</div>
						<?php } ?>
						<?php if(is_author()) { ?>
						<div id="archive-title">
						Browsing articles by "<strong><?php wp_title('',true,''); ?></strong>"
						</div>
						<?php } ?>
					<!-- /archive-title -->
		<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

        <!-- begin post -->
        <div class="blogPost">
        				<div class="date"><?php the_time('M') ?><br /><span><?php the_time('j') ?></span></div>
						<h1><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h1>
						<div class="meta">
							By <span class="author"><?php the_author_link(); ?></span> &nbsp;//&nbsp;  <?php the_category(', ') ?>  &nbsp;//&nbsp;  <?php comments_popup_link('No Comments', '1 Comment ', '% Comments'); ?>
						</div>
						<?php the_content(__('read more')); ?> 

		</div>
		<!-- end post -->
		<?php endwhile; ?>

	<?php else : ?>

		<p>Sorry, but you are looking for something that isn't here.</p>

	<?php endif; ?>
    		</div>
            <!-- end colLeftInner -->
            <div class="navigation">
						<div class="alignleft"><?php next_posts_link() ?></div>
						<div class="alignright"><?php previous_posts_link() ?></div>
			</div>
		</div>
		<!-- end colLeft -->

<?php get_sidebar(); ?>	

<?php get_footer(); ?>

and home.php:

<?php get_header(); ?>

<!-- begin colleft -->
				<div id="colLeft">
				<div id="colLeftInner" class="clearfix">
					<!-- begin fetured post -->
				 <?php query_posts('tag=featured');?>
                     <?php if (have_posts()) : while (have_posts()) : the_post(); ?>
					<div id="featuredPost">
						<span class="label">FEATURED POST</span>
						<h1><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h1>
						<div class="meta">
							By <span class="author"><?php the_author_link(); ?></span> &nbsp;//&nbsp;  <?php the_category(', ') ?>  &nbsp;//&nbsp;  <?php comments_popup_link('No Comments', '1 Comment ', '% Comments'); ?>
						</div>
						<div class="featuredDetails"><?php the_excerpt()?>
                        <?php $featured_img = get_post_meta($post->ID, 'featured_img', $single = true); ?>
						<a href="<?php the_permalink(); ?>"><img src="<?php echo $featured_img ?>" border="0" alt="<?php the_title(); ?>" /></a>
						</div>
					</div>
					<!-- end featured post -->
                   <?php endwhile; ?>
                        <?php else : ?>
                    <?php endif; ?>

					<?php wp_reset_query(); // for pagination ?>

<?php $paged = (get_query_var('paged')) ? get_query_var('paged') : 1; // for pagination ?>				

					<?php $posts_query = new WP_Query($query_string.'&tag=homepost&posts_per_page=-1&paged='.$paged);
						  if(!$posts_query -> have_posts()){
							  $latestposts_no = get_option('designpile_latest_posts');
							  if($latestposts_no != null){
								 $posts_query = new WP_Query($query_string.'&posts_per_page='.$latestposts_no.'&paged='.$paged);
							  }else{
								 $posts_query = new WP_Query($query_string.'&posts_per_page=6&paged='.$paged);
							  }
						  }
						  $odd_or_even = 'odd'; ?>
                        <?php if ($posts_query -> have_posts()) : while ($posts_query -> have_posts()) : $posts_query -> the_post();  ?>
                        <div class="homePost <?php echo $odd_or_even; ?>">
                            <div class="date"><?php the_time('M') ?><br /><span><?php the_time('j') ?></span></div>
                             <div class="meta">
                                By <span class="author"><?php the_author_link(); ?></span> &nbsp;//&nbsp;  <?php comments_popup_link('No Comments', '1 Comment ', '% Comments'); ?>
                            </div>
                            <h2><a href="<?php the_permalink() ?>"><?php the_title(); ?></a></h2>

                            <div><a href="#"><img src="<?php if ( function_exists('p75GetThumbnail') )echo p75GetThumbnail($post->ID); ?>" alt="" /></a><?php the_excerpt(); ?> </div>
                        </div>
                        <?php $odd_or_even = ('odd'==$odd_or_even) ? 'even' : 'odd'; ?>
                        <?php endwhile; ?>

                        <?php else : ?>

                            <p>Sorry, but you are looking for something that isn't here.</p>

                        <?php endif; ?>

					 </div>
					<!-- end colleftInner -->
	<div class="navigation">
		<div class="alignleft"><?php next_posts_link('&laquo; Older Entries'); // pagination ?></div>
		<div class="alignright"><?php previous_posts_link('Newer Entries &raquo;'); // pagination ?></div>
	</div>
				</div>
			<!-- end colleft -->
			<?php get_sidebar(); ?>	

<?php get_footer(); ?>

I’ll post it on pastebin if necessary, just tell me.
Thank you.