title: how to open different form on different radio button
body: <p>i have three radio button, i want that my one radio button checked by default and form "a" remains open untill the user click on another radio button. The form below change with respect to the radio button; </p>
  
  <p>Here is the code:</p>
  
  <pre><code>&lt;label&gt;&lt;input type="radio" name="colorCheckbox" value="red" checked&gt; red&lt;/label&gt;
  &lt;label&gt;&lt;input type="radio" name="colorCheckbox" value="green"&gt; green&lt;/label&gt;
  &lt;label&gt;&lt;input type="radio" name="colorCheckbox" value="blue"&gt; blue&lt;/label&gt;
  
  &lt;div class="form-a" &gt; &lt;/div&gt;
  &lt;div class="form-b" &gt; &lt;/div&gt;
  &lt;div class="form-c" &gt; &lt;/div&gt;
  </code></pre>