Code to make Form results open in specific frame in frameset

Interested parties I will send a link to. I'm trying to figure out how to have FORM results open up in a specific frame of a frameset. There is a widget feature on the home page of a site I've built that does a quick real estate search. You can put this widget on your home page, but when the submit button is pressed it opens up a page with the Search Results on it. I would like the Search Results to be displayed in the bottom frame of a frameset I have created with the top frame frame for branding and navigation. I can control what is on my page, but the search form is going to another site to process. How can I make the results display inside my frameset? Thank you.