How to include a specific categories in the single PAGE

I using query_posts() retrieve a particular category before The Loop begins, to show a specific posts which is in this category. the results of output is right, but the page navigation could not operate that’s the problem is. so please, How to include a specific categories in the single PAGE (and the page navigation could operate)by a right way? thanks!

the problem PAGE is here, link

and the template main code is:

<ul>
<?php query_posts('cat=8'); ?>
	<?php while (have_posts()) : the_post(); ?>
	<?php the_title(); ?>
	...
	<?php endwhile;?>
</ul>