title: Selecting an option in drop down menu one determines list available in the second drop down menu
body: <p>I want to make the contains of a second drop down menu dependent on what is selected in the the first. In my case wish to do it for a car selection option. i.e when the car make is selected this then populates the model drop down menu with the relevant models.</p>
  
  <p>As there are a lot of makes of car I would like to keep it concise if possible I presume arrays of models for each make is the solution but how do implement this.
  I have look at various solutions and cannot find a suitable answer to this, any suggestions/examples would be gratefully appreciated.</p>
  
  <p>I am using jsp.</p>
  
  <pre><code>Make:&lt;select&gt;
      &lt;option value="audi"&gt;Audi&lt;/option&gt;
      &lt;option value="bmw"&gt;BMW&lt;/option&gt;
      &lt;option value="ford"&gt;Ford&lt;/option&gt;
      &lt;option value="toyota"&gt;Toyota&lt;/option&gt;
  &lt;/select&gt; 
  </code></pre>