How to add Javascript advert after Author box and before comments

Hi!

I would like to insert an ad tag from content.ad after my Author bio box and before my comments section. They do have a plugin but it places the ad before my Author bio box, making it look bad.

The code is javascript and also has a div tag. I was thinking of adding it to page.php before <?php comments_template(); ?> but that didn’t work.

Any idea?