Excluding certain Pages form Search

Hi,

i want to exclude some specific Pages (and may be Posts in the Future) from the Search Function using the PageNavi-Plugin. What i’ve got is excluding Categories:

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
query_posts("s=$s&paged=$paged&cat=-10");
if(function_exists('wp_pagenavi')) { wp_pagenavi();} ?>

Why doesn’t this work (assuming the hideaway is an Array with Post-ids)?

query_posts("s=$s&paged=$paged&cat=-10&exclude=".implode(",",$hideaway));

Is there any Way to avoid a Custom-Query?

Thanks for your help