upstairs/upward/up

[david-us.livejournal.com]

Just when I thought I understood the use of these words, I run across sentences that confuse me.

Could one of you native Russians kindly break these down and use them each in a sentence - highlighting how they differ from one another?

наверх
навверху
вверх
вверху

And, I guess, while you're at it - you might as well address вниз/внизу.

I realized I had a problem when I ran into an elderly Russian woman (who did not speak English) at an airport baggage claim area and she was asking about where the ticket counter was located. I was trying to tell her to go "up" the escalator and realized I wasn't sure exactly how to say this properly. I got my point across, however. I probably sounded like an idiot, though.

Thanks!

David Emerling
Memphis, TN