Magento Hosting : Disable Field tied to other field value

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This magento discussion was started by gramulhaozin on 03 july 2009

In the product custom options, I would like to have an option:

“Are you purchasing from USA ?” : YES / NO (radio button)

If the user select YES then I would add a TextBox and REQUIRE the user to type in his License Number.

Is it possible ?

Is there any other way to require extra information during checkout based on where the user is purchasing from ?

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