I've tried installing both this module and Ajax Login/Registry to solve the following use case: when an anonymous user views a node which allows comments, he is invited to "login or register" to comment on the node (anonymous users are not allowed to comment). What I want is for him to click on "login" (or "register") and enter his details (id and password for example) in an Ajax form (so the page does not have to reload), and then be taken to the comment form.
I can't make out from the documentation whether this ought to be possible just using the Ajax module. I have enabled the Ajax and Ajax thickbox modules, and checked the "login" and "register" forms in the Ajax settings. However, when an anonymous user clicks on the "login to comment" link, instead of getting a thickbox modal form he gets an ordinary page, and worse still when he presses the "submit" to login, he gets the "page not found" message (apparently because the hash has been changed into an HTML element:

http://10.156.240.143/drupal-test/?q=comment/reply/36%23comment-form&1272879037=1

instead of 

http://10.156.240.143/drupal-test/?q=comment/reply/36#comment-form&1272879037=1

I can't help thinking I'm doing something wrong, or that I have completely missed the point - but would be grateful of help.