Response form in a specified frame and in same window

I have a frameset with two frames, where a view is at the top frame and a page is at the bottom frame.

After selecting a document in the view and clicking a ‘OPEN’ action button a form is set to be opened in the bottom frame containing the selected document. It’s okay.

Now here at this opened document in the bottom frame I have a ‘RESPOND’ action button. By clicking that button a Response to Response form will be opnened which is set to create a response of the main document.

I want to open that Response to Response form in that same window and in the bottom frame (N.B.: not in another window).

How can I do that?

Please help me. Thanking you very much. Looking forward.