I am using Google Maps in a project and I want to display only a country map in my map window i.e. I want only the US to show on my map not Canda and Mexico and so on, cutti
Check out one of Mike Williams' great GMaps tutorials: in there, he shows how to limit zoom and pan in your map.
If you want some areas to be non-visible, try this one: I think that's closest to what you want (the example actually does the same thing you want, but it seems to be geared towards Canadians ;)).