The title is self-explanatory, I hope. 
I'm not particularly happy with the way it looks, so any improvement suggestions will be appreciated. 

As for the implementation, I added the 'base_reply_to' field to the ReviewReplyResource so I could get the body_top and body_bottom text of the original review. If this is ok, then we could probably drop the get_base_reply_to_field method in the same class.

Still TODO: eliminate duplication between the javascript functions for expanding review and reply boxes