HTML Field

I have an HTML field which has a button to do a post to a jsp page which allows me to upload a file. Once the upload is completed, the user is presented with a form to modify the uploaded file before submitting it to a DTM driver where is processed. So far so good, this all works (my form takes over the PRD form completely).

So when I am done I want to submit the PRD. But the buttons are gone.

I tried this in an iframe but then I get a little tiny window into my form.

So, is there a way to programmatically submit the form at this point? Or to instantiate the buttons in my JSP page so they are available to the user at the end?

Or am I too deep into unsupported land?

thanx
Rob