Zend_Form cross validation

I'm working on a system and i have a form where i need to do cross validations. By cross validation i mean : if someone is from the united states the system must be able to check if the state that have been selected is a valid united states state and not a canadian province. Ideally, the error output message should be beside the fautive field. (i use default zend_form decorators)At this stage i'm looking to avoid ajax to be sure that my php fallback work in the case where the user has disabled javascript. In the future i will reload the list and display states/provinces acording to the country.
 
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