Create a HTML page, used Ajax, PHP

Create a HTML page where a user can select a state from a list of all 50 states. When the user select the state, the web page must make an Ajax call to fetch the capital of the state and display it in another text box.  You will need to create a HTML page the user will interact with and a PHP script which will process the request.  You must use the cross browser approach for creating the XMLHttpRequest and I suggest you simply use PHP's print method to return the results.