Page category?

Hi, I made a search results page. Because I wanted to exclude all posts of category 1 I putted this code in search.php :

<?php
$page = (get_query_var('paged')) ? get_query_var('paged') : 1;
$s = get_query_var('s');
query_posts("s=$s&cat=-1&paged=$page");
?>

So when I do that, you won’t see post from category 1, but also no pages ( like : about, contact ). Is this a bug, or did I do something wrong?