There's a little lozenge on the right side of the window (opposite of the close, minimize, and zoom buttons). I have a feeling that you have the Finder windows set to do spatial navigation (where it opens a window for every opened folder) as opposed to browser navigation (where it opens in the same window). The browser navigational window usually has a toolbar along with the aliases on the left side of the Finder window. If not, then you're in spatial view mode.