Would you help me because I'm very confused.
I'm newbie, in try to use wordpress to build new site.
but my previous/next page link not working and not send me anywhere.
This code from archive.php and search.php
<?php posts_nav_link(' — ', __('« Previous Page'), __('Next Page »')); ?>
But at my index.php, no have this code.
When I try to put this code to my index.php, this previous/next link not send me anywhere. I dont know how to solve this trouble.
Would you help me?
Below is my full index.php

PHP Code:

 <?php
get_header();
?>
 <?php include (TEMPLATEPATH . "/frame.php"); ?>
 <div id="content-big">
 <?php $count = 0;?>
        <?php query_posts('showposts=15'); ?>
    <?php if (have_posts()) : ?>
 <?php while (have_posts()) : the_post(); ?>
 <div class="postindex" id="post-<?php the_ID(); ?>">
 <h2>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></h2>
 <div class="entry">
 <?php the_excerpt(__('Readmore �'));?>
 </div>
<div class="spacer"></div>
    <ul class="post-data">
    <li class="comments">
<?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?>
     <li class="posted">
<?php the_time('F jS, Y') ?> by <?php the_author() ?> <?php edit_post_link('Edit','',''); ?> 
 </div>
 <?php comments_template(); ?>
 <?php endwhile; else: ?>
<p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
<?php endif; ?>
 <?php posts_nav_link(' — ', __('« Previous Page'), __('Next Page »')); ?>
 <?php get_footer(); ?>

Thank you very much for your advance.
Regards
Edwin

Before you dig into the code, check your settings in the admin area. Settings -> Reading -> Blog pages show at most. This number has to be less than the total number of posts you have in order for paging to work.

If this is a new blog, you may not have more than 10 posts yet, therefore, the previous-next links wouldn't go anywhere.

Further reading:
http://digwp.com/2009/08/wordpress-page-navigation/

Also, when using query_posts you need to add before the query:

PHP Code:

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1; 


This will allow paging to work.