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I am using the wp-pagnavi plugin. I cannot figure out why my page 2 shows the same post as the first page.`get_header(); ?>

<div id="main-content" class="clearfix">

<div class="container">

<div class="col-580 left">

<?php

query_posts( 'showposts=8' );

if (have_posts()) :

while (have_posts()) : the_post(); $category = get_the_category();

?>

<div <?php post_class(); ?>>

<div class="post-meta clearfix">

<h3 class="post-title left">" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></h3>

<p class="post-info right">

<?php the_time( 'l F j, Y' ) ?>

</p>

</div><!-- End post-meta -->

<div class="post-box">

<div class="post-content">

<?php if( get_post_meta( $post->ID, "image_value", true ) ) : ?>

<div class="post-image">

" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><img src="<?php bloginfo( 'template_directory' ); ?>/timthumb.php?src=<?php echo get_post_meta( $post->ID, "image_value", true ); ?>&w=620&h=350&zc=1" alt="<?php the_title(); ?>" />

</div>

<?php endif; ?>

<div class="post-intro">

<?php the_content( '' ); ?>

</div><!-- End post-intro -->

</div><!-- End post-content -->

<div class="post-footer clearfix">

<div class="continue-reading">

#more-<?php the_ID(); ?>" rel="bookmark" title="Continue Reading <?php the_title_attribute(); ?>">Continue Reading

</div>

<div class="category-menu">

<div class="category clearfix">

<div><span class="indicator"></span> <?php echo $category[0]->cat_name; ?></div>

</div>

<div class="dropdown">

<ul class="cat-posts">

<?php

$posted = get_posts( "category=" . $category[0]->cat_ID );

if( $posted ) :

foreach( $posted as $post ) : setup_postdata( $posted );

?>