search.php – displaying results without pagination

in my admin panel I’ve set WP to display 3 posts per page and it works but I’ve noticed that this also influences the number of search results…

I’d like all of my search results to be displayed on one single page, how do I do that?

I reckon that the easiest way would be to change $posts_per_page; but I can’t figure out ho to change it just for the search.php template

I’ve also found something like <?php query_posts(‘posts_per_page=-1&post_type=post’); ?>
but for the love of god I can’t make it show ONLY the search results

help…