Use frames without the border inbetween

I’ve done some reading and experimenting about using frames, but there always seems to be the same problem:
When I create a page that uses frames in Adobe GoLive, there always seems to be a border between the frames.
I’d like to make a layout that has a navigation bar on the left and the actual page on the right. It should look as if they’re just two separate things on a black background: like a remote control lying next to some kind of screen.
I made the image files already but I want to get rid of the border inbetween…

Does anyone know how to do this?