Problem with pages next and back

sorry but in home page links working 100 % please check http://www.khabar3ajel.com and click on

المواضيع السابقة = ” previous post “

working !

i guess the problem in my archive page ?

<?php get_header(); ?>

<div id="content">

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

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

            <div class="post" id="post-<?php the_ID(); ?>">

<?php $screen = get_post_meta($post->ID,'screen', true); ?>
<img src="<?php echo ($screen); ?>" width="80" height="55" alt=""  />
<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>"><?php the_title(); ?></a></h2>
<div class="date"> </div>    

<div class="mentry">

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

</div>

<div class="postinfo">
                    <div class="time"><?php the_time('F - j - Y'); ?> </div>
                    <div class="rmore"><a href="<?php the_permalink() ?>">إقرأ المزيد</a> </div>
</div>

</div>
        <?php endwhile; ?>

        <div class="navigation">
            <div class="alignleft"><?php next_posts_link('المواضيع السابقة &raquo;') ?></div>
            <div class="alignright"><?php previous_posts_link('&laquo;المواضيع الجديدة') ?></div>
        </div>

    <?php else : ?>

        <div class="post">
            <h1 class="title">غير موجود</h1>
            <p>أسف, لكنك تبحث عن شيء غير موجود هنا.</p>
        </div>

    <?php endif; ?>    

</div>

<?php get_sidebar(); ?>

<?php get_footer(); ?>

yeah esmi , working 100 % in categories

and the link look like this :
http://localhost/wordpress/?cat=1&paged=2

my permalink was :
/%category%/%postname%/

up urgent plz