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I would not worry about moving the code, I would use html5 elements to tell the search engine what is what. Such as <header> <nav> <menu> <aside></aside> </menu> </nav> </header>

I also like "openings" in the URL, because as a user, if I were to land on that page or see that URL in the wild, I'd have a better idea of what the page is about. -Dan