Borderline Chaos link trouble

Same problem, different theme. Last time miklb helped me out. I’m using Marianne’s Borderline Chaos, but 1 problem. I’ve got a number of sub-pages under a main page, and I don’t want these to show up as links on the main navigation, because the sheer amount of pages & sub-pages I have is pushing the links over on to the contents of my weblog. Ideally I’d have a pop-up menu for sub-pages, and only have links to my main pages. Helf!!