Building a HTML select using geognos.com API? [closed]

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http://serverfault.com – In my application 2-character ISO Code for countries are stored in table. I can call this out and build a pull-down menu easily. However, I want the "value" to store geognos's "TelPref". What's the simplest way to do this? Geognos site : http://www.geognos.com/geo/en/world-countries-API.html (HowTos)