How to set up oscommerce Shipping to these settings?

I need to set it up so that it is:

• $4.95 flat rate for anywhere in US.
• 开发者_运维技巧$11.95 for anywhere else in North America.
• $13.95 for anywhere else in the world.

Is this possible to do?

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Take a look at the multi geozone multi table shipping mod.

http://addons.oscommerce.com/info/2571

If you prefer, you could clone the build-in zones mod twice, and apply the original to the US, the first clone to Canada/Mexico and the second clone to everywhere else.