title: jQuery Datepicker with text input that doesn't allow user input
body: <p>How do I use the jQuery Datepicker with a textbox input:</p>
  
  <pre><code>$("#my_txtbox").datepicker({
    // options
  });
  </code></pre>
  
  <p>that doesn't allow the user to input random text in the textbox.
  I want the Datepicker to pop up when the textbox gains focus or the user clicks on it, but I want the textbox to ignore any user input using the keyboard (copy &amp; paste, or any other). I want to fill the textbox exclusively from the Datepicker calendar.</p>
  
  <p>Is this possible?</p>
  
  <p>jQuery 1.2.6<br/>
  Datepicker 1.5.2</p>