title: Change the value of checkbox when checked
body: <p>Is it possible to <strong>change the value</strong> of checkbox from TRUE to FALSE and vice versa when the checkbox is checked? I can write a JQuery on change event and change the value but was wondering if there is an other way in HTML? </p>
  
  <pre><code>&lt;input name="bool_flg" id="bNow_flg" type="checkbox" value="true"&gt;
  </code></pre>