This code doesnt show my post.

Hello, im trying to customize the theme that i downloaded on the internet..

The categories of the post are posted like this:

<?php if(!is_paged()) { ?>

	<div id="middle" class="clearfloat">
	<img src="<?php bloginfo('template_url'); ?>/images/category.png" class="clearfloat" alt="" />
	<?php $display_categories = array(1,46,48,49,50); $i = 1;
	foreach ($display_categories as $category) { ?>

	<div id="cat-<?php echo $i; ?>" class="category" onclick="window.location.href='<?php echo get_category_link($category);?>'" >
		<?php query_posts("showposts=1&cat=$category")?>
		<?php if (is_category($category)) { ?>
		<span class="cat_title"><?php single_cat_title(); ?></span>

		<?php echo category_description($category);  } ?>
	</div>

	<?php $i++; ?>
    	<?php } ?>

	</div>

and this not show up on the single post and pages.. now im trying to put it on single and pages.. but when i tried to paste it the home page is working but when i click on the title of the topics, the single post said that “Sorry, no posts matched your criteria.”

but when i removed it again. the post showed up..

Thanks!