Well, I don't mind dong the Javascript part of it if you want that, but just a word of advice on the Javascript side of things. When you add new elements to the form and hide them, Safari actually classes that as a breach of security and doesn't include the item when you submit the form, so the best way to do it is to simply use the position CSS attribute to place an element over the top of the other one. Therefore the one below is still technically visible to the browser, just not to the user.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.