Add Sticky Post top of Category page

I am trying to have sticky posts stay on the top of a category page. I have tried a couple of plugins, and they have not worked. So I found some code online, and it has worked perfectly.

Except now I need to be able to order the rest of the post by date, title, etc., and have not been able to figure out how.

Here is a link to the code I am using code

My questions is where would I add:
<?php if (is_category()) { $posts = query_posts( $query_string . '&orderby=date&order=dsc' ); } ?>

to get the desired result.