As an add-on to our previous job, I am hoping you can also put in a text field, and submit button into our HTML. This submit button will send add a post to a specific discussion forum thread. There is a discussion forum already setup, and I want to be able to create a thread on that forum, and then for someone to add a reply to that thread through our HTML page. The authentication for adding the post onto the forum shouldn't be a problem, since getting access to our HTML page automatically authenticates access to the discussion forum too. I can provide the coding that the discussion forum uses, so hopefully you can copy and paste some of that into our HTML code.
I'm not 100% sure that what I'm after is possible, but if it is then I'd be keen to have it as part of our code. If you have any questions, I will answer them through our normal chat on Skype.