> I want to hide all others countries visible beside mine,

Recent similar post
http://groups.google.com/group/google-maps-js-api-v3/browse_thread/thread/4c68ef61c001bd82/6cc6f8ba9deb97d1

Why not just add a large opaque border to your existing groundoverlay?
Limit zoom and pan so a user can't stray outside your border.

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