[Plugin: Simple Pagination] Cannot get pagination working

I have the following code in my pages.php:

<?php
if (is_page() ) {
$category = get_post_meta($posts[0]->ID, 'category', true);
}
if ($category) {
  $cat = get_cat_ID($category);
  $paged = get_query_var('paged') ? get_query_var('paged') : 1;
  $post_per_page = 15; // -1 shows all posts
  $do_not_show_stickies = 1; // 0 to show stickies
  $args=array(
    'category__in' => array($cat),
    'orderby' => 'date',
    'order' => 'DESC',
    'paged' => $paged,
    'posts_per_page' => $post_per_page,
    'caller_get_posts' => $do_not_show_stickies
  );

  $temp = $wp_query;  // assign orginal query to temp variable for later use
  $wp_query = null;
  $wp_query = new WP_Query($args);
  if( have_posts() ) :
		while ($wp_query->have_posts()) : $wp_query->the_post(); ?>
	    <div <?php post_class() ?> id="post-<?php the_ID(); ?>">
        <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>
        <small><?php the_time('F jS, Y') ?>  by <?php the_author() ?> </small>
[/code]

It only shows posts from one category per page – but the pagination doesn’t show – after installing Simple Pagination I get the first Page icon, but nothing else.

Can anyone tell me where I’m going wrong?

Many thanks

http://wordpress.org/extend/plugins/simple-pagination/