Refreshing entire framesets without opening a new window - Does anyone know if it's possible / how?

Here's my problem.......I have a webpage consisting of two frames. It's a graphic version. I want to have a link off of one of those frames that will replace that whole frameset with the new text version (frames also) -- not opening a new browser window. I tried going to a separate HTML document that does a refresh to the new frameset -- but it still opens it in whatever frame the link is in. It won't replace what's already there (both frames at once). I guess I'm just going to have to settle for opening a new browser window which I don't want to do -- because for some users that gets confusing......any ideas would be appreciated.