My sticky posts aren't appearing at the top using this script

I’m using a script for a content area on my index.php template that pulls the last three posts from my site. I made a number of posts sticky, so they would appear on top, but that’s not happening here in this instance.

Here’s how I’m bringing in the posts:

<?php
    $myquery = new WP_Query();
    $myquery->query('cat=6&showposts=3');
?>
<?php if ( $myquery->have_posts() ) : while ( $myquery->have_posts() ) : $myquery->the_post(); ?>

And then I follow it up with standard code to pull in my data like the_title(). Again, it works but it doesn’t respect the sticky posts at all. How can I correct that?