Order wordpress comments in descending order and provide a toggle to switch to ascending order

My wordpress comments now are in ascending order. I wanted to display it by default in descending order.I have done this via admin panel by going to Settings->Discussion.

But now I want to provide an option to the user so that he can toggle this ordering if he needs. That is, by default comments would be in descending order of date but if the user wants he can view the comments in ascending order at the click of maybe a link or button. Is this possible?

I am using Greg's threaded comments to display my comment section.

via Chebli Mohamed