[Plugin: WP-Paginate] Can't install on

Hi all, I’m new to WP and I have inherited a custom theme based on a theme called “omnommonste” (?). Anyway, there is no loop.php file to alter so I have changed index, archive and search as recommended. I have replaced the highlighted code

<div class="navigation">
			<div class="alignleft"><?php next_posts_link('« Previous Entries') ?></div>
			<div class="alignright"><?php previous_posts_link('Next Entries »') ?></div>
		</div>

with this

<div class="navigation">
			<?php if(function_exists('wp_paginate')) {wp_paginate();} ?>
		</div>

Is this right? Trouble is it’s not working. Anyone able to assist with what I’m doing wrong. THANKS!!!

Here is my revised index.php

<?php get_header(); ?>
<?php get_sidebar(); ?>
<div id="wrapper">
	<div id="content">

	<?php if (have_posts()) : ?>

		<?php while (have_posts()) : the_post(); ?>

			<div class="post" id="post-<?php the_ID(); ?>">
				<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2>
				<small><?php the_time('F jS, Y') ?> <!-- by <?php the_author() ?> --></small>

				<div class="entry">
					<?php the_content('Read the rest of this entry »'); ?>
				</div>

				<p class="postmetadata">Categories: <?php the_category(', ') ?> <strong>|</strong> <?php the_tags('Tags: ', ', ', '<strong>|</strong>'); ?> <?php edit_post_link('Edit','','<strong>|</strong>'); ?>  <?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?></p>
			</div>

		<?php endwhile; ?>

		<div class="navigation">
			<?php if(function_exists('wp_paginate')) {wp_paginate();} ?>
		</div>

	<?php else : ?>

		<h2 class="center">Not Found</h2>
		<p class="center">Sorry, but you are looking for something that isn't here.</p>
		<?php include (TEMPLATEPATH . "/searchform.php"); ?>

	<?php endif; ?>

	</div>

</div>

<?php get_footer(); ?>

Here is my revised archive.php

<?php get_header(); ?>
<?php get_sidebar(); ?>
<div id="wrapper">
	<div id="content">

		<?php if (have_posts()) : ?>

		 <?php $post = $posts[0]; // Hack. Set $post so that the_date() works. ?>
<?php /* If this is a category archive */ if (is_category()) { ?>
		<h2 class="pagetitle">Archive for the '<?php echo single_cat_title(); ?>' Category</h2>

 	  <?php /* If this is a daily archive */ } elseif (is_day()) { ?>
		<h2 class="pagetitle">Archive for <?php the_time('F jS, Y'); ?></h2>

	 <?php /* If this is a monthly archive */ } elseif (is_month()) { ?>
		<h2 class="pagetitle">Archive for <?php the_time('F, Y'); ?></h2>

		<?php /* If this is a yearly archive */ } elseif (is_year()) { ?>
		<h2 class="pagetitle">Archive for <?php the_time('Y'); ?></h2>

	  <?php /* If this is a search */ } elseif (is_search()) { ?>
		<h2 class="pagetitle">Search Results</h2>

	  <?php /* If this is an author archive */ } elseif (is_author()) { ?>
		<h2 class="pagetitle">Author Archive</h2>

		<?php /* If this is a paged archive */ } elseif (isset($_GET['paged']) && !empty($_GET['paged'])) { ?>
		<h2 class="pagetitle">Blog Archives</h2>

		<?php } ?>

		<div class="navigation">
			<?php if(function_exists('wp_paginate')) {wp_paginate();} ?>
		</div>

		<?php while (have_posts()) : the_post(); ?>
		<div class="post">
				<h3 id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h3>
				<small><?php the_time('l, F jS, Y') ?></small>

				<div class="entry">
					<?php the_excerpt() ?>
				</div>

				<p class="postmetadata">Posted in <?php the_category(', ') ?> <strong>|</strong> <?php edit_post_link('Edit','','<strong>|</strong>'); ?>  <?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?></p> 

			</div>

		<?php endwhile; ?>

		<div class="navigation">
			<div class="alignleft"><?php if(function_exists('wp_paginate')) {
    wp_paginate();
} ?></div>
			<div class="alignright"><?php if(function_exists('wp_paginate')) {
    wp_paginate();
} ?></div>
		</div>

	<?php else : ?>

		<h2 class="center">Not Found</h2>
		<?php include (TEMPLATEPATH . '/searchform.php'); ?>

	<?php endif; ?>

	</div>

</div>
<?php get_footer(); ?>

and finally, here is my revised search.php

<?php get_header(); ?>
<?php get_sidebar(); ?>
<div id="wrapper">
	<div id="content">

	<?php if (have_posts()) : ?>

		<h2 class="pagetitle">Search Results</h2>

		<div class="navigation">
			<?php if(function_exists('wp_paginate')) {wp_paginate();} ?>
		</div>

		<?php while (have_posts()) : the_post(); ?>

			<div class="post">
				<h3 id="post-<?php the_ID(); ?>"><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h3>
				<small><?php the_time('l, F jS, Y') ?></small>

				<div class="entry">
					<?php the_excerpt() ?>
				</div>

				<p class="postmetadata">Posted in <?php the_category(', ') ?> <strong>|</strong> <?php edit_post_link('Edit','','<strong>|</strong>'); ?>  <?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?></p>
			</div>

		<?php endwhile; ?>

		<div class="navigation">
			<?php if(function_exists('wp_paginate')) {wp_paginate();} ?>
		</div>

	<?php else : ?>

		<h2 class="center">Not Found</h2>
		<?php include (TEMPLATEPATH . '/searchform.php'); ?>

	<?php endif; ?>

	</div>

</div>
<?php get_footer(); ?>

http://ww.wp.xz.cn/extend/plugins/wp-paginate/