In single.php, in wordpress 3.1, I want the ol that displays comments to have list-style-type of none so you don't see a number before each comment. But how can I target just the ol in comments without removing list-style-type for other content?

In wp 2.8 the ol has a class of commentlist. (was easy to target)
In wp 3.1 the ol doesn't have it's own class but each li has a different ID and class.

Any ideas?
Thank you,
Charlie