title: How to populate a dropdown list based on values of the another list?
body: <p>I want to implement a search box same as <a href="http://www.rentalcars.com/" rel="nofollow">this</a>, at first, just first dropdown list is active once user selects an option from the first dropbox, the second dropdown box will be activated and its list will be populated.</p>
  
  <pre><code>&lt;s:select id="country" name="country" label="Country" list="%{country} onchange="findCities(this.value)"/&gt;
  
  &lt;s:select id="city" name="city" label="Location" list=""/&gt;
  </code></pre>