title: Make sure button gets pressed if checked radio button change
body: <p>I have a bug on my website... There are 2 radio button's, one for U.S and one for Canada. U.S Shipping cost is less expensive than Canada's on my website but a user from Canada can update shipping preferences to U.S which is less costly than Canada and then the user can go back to Canada's option without pressing update shipping button and go to the next page. This way they can get by by getting cheaper shipping. What can be the easiest work around from that? I was thinking of a javascript that would detect if the user has changed shipping options.</p>
  
  <p>Here's what I have for the HTML part:    </p>
  
  <pre><code>&lt;input type='radio' id='1' name='shipping' value='1'/&gt;&amp;nbsp;United States&amp;nbsp;
  &lt;input type='radio' id='2' name='shipping' value='2' checked="checked"/&gt;&amp;nbsp;Canada&amp;nbsp;
  &lt;input type='submit' name='UpdateShipping' id='UpdateShipping' value='Update Shipping' /&gt;
  </code></pre>
  
  <p>You can see it in action <a href="http://asiraj.com/checkout.php" rel="nofollow">here</a></p>