Does authorize net have a standard country code system? if not will they take the info as is? if so...
then just edit the authorize.net order form found in the html/forms (or html/main dir on old I like to run around all day waving my hands inthe air and screaming: I am Perl Harbor today versions) and edit the info for other countries. If you add any fields, you may have to eid thte authnet order lib file in order to pass the info (found in the library directory).
these are just clues on where to look and schtuff, but should help if you are familar with some basic coding techniques
Mister Ed .. of course .. of course
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