Dreamwidth Development Training

So the new comment preview page, which shows who you are posting the comment as, is working on my 'hack. Yay! That actually fulfills the bug, but there's something else I want to do as part of it for extra functionality, because it occurs to me that you can now see who you're commenting as, but you don't have an easy way to go back and change it apart from the back button.

So, I want to add a More Options button.

Obviously, adding the actual button is Not Very Hard. What is hard is getting this button to actually take you to the reply page - that's mode=reply for top-level comments, or replyto=$commentid for comment replies.

I've been trying to go through various pages (Talk.pm, talkpost_do.bml, talkread.bml) to find out how the regular comments page does it, so I can try to replicate that. But I'm having another "forest of code" problem and I can't trace the code path from the more options button to loading the next page...

Could anyone help me figure out what's going on here so I can reproduce it?

Thanks!