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Question: Am thinking about if the user selected an a country the city option changes and you can select the country....
Robert Leonardi17,151 Points
Salvador Cervantes10,898 Points
The following Links are a great start. I would recommend you get a basic understanding of JS and Jquery. using the links that Robert posted.
Once you have done that, you would need to do a little research to look for something long the lines of what your trying to do! if your starting out, Please try as hard as you can do not find a code already like this and copy and paste. Try to write it your self, so next time when you do copy and paste, you understand what is going on :D