navigation not working

hi,

i dnt know y but navigatio on my sites category page is not working ..it is showing the same articles

here is the cat page link :

https://karomasti.com/telugu-cinema/category/reviews/

below is the code tht i have used ..

<?php global $theme_options, $newspaper; ?>
<?php get_header(); ?>

	<div id="innerLeft">
			<div id="entryMeta">
				<h2 class="singlePageTitle">Tollywood <?php single_cat_title(); ?></h2>
			</div>
<br /><div id="innerContent">

<div>

            <br />

</div><ul class="cat-list">

        </ul><h2 class="singlePageTitle">Latest Movie Reviews</h2>
            <br />
							<div class="post">
					<?php
						$myqueryname = $wp_query;
						$wp_query = null;
						$wp_query = new WP_Query();
						$wp_query->query('cat=11&showposts=6');
						if (have_posts()) : while (have_posts()) : the_post();
					?>
					<div class="photoFrame">
						<div class="photoFrameInner">
							<a href="<?php the_permalink() ?>"><img src="<?php $values = get_post_custom_values("thumb"); echo $values[0]; ?>" width="234" height="200" alt="<?php the_title(); ?>" /></a>
							<h2 class="titlePhotoCat"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>
							<br /><div class="postinfoPhotoCat"><?php the_time('F j, Y'); ?> | <a href="<?php the_permalink() ?>" rel="bookmark"><?php echo $newspaper["permalink"]; ?></a></div>
						</div>
					</div>
					<?php endwhile; else : endif; ?>
					<div class="clear"></div>
				</div>

				<div class="navigation">
					<div class="previous"><?php posts_nav_link('','','&laquo; '.$newspaper["previous"]) ?></div>
					<div class="next"><?php posts_nav_link('',''.$newspaper["next"].' &raquo;','') ?></div>
					<div class="clear"></div>
				</div>

			</div><!-- Enf of innerContent -->

		<div id="midSidebar">
			<div id="midSidebarInner">
			<?php include (TEMPLATEPATH . '/innerMidSidebar.php'); ?>
			</div>
		</div><!-- End of midSidebar -->
		<div class="clear"></div>
	</div><!-- End of innerLeft (Content + Middle sidebar) -->

	<div id="rightSidebar">
		<?php include (TEMPLATEPATH . '/innerRightSidebar.php'); ?>
	</div><!-- End of rightSidebar -->
	<div class="clear"></div>

	<?php get_footer(); ?>

</div><!-- enf od wrapper -->

</body>
</html>