title: Reveal DIV when Checkbox = Checked HTML
body: <p>I've seen similar questions here, but none have helped. So here's what I'm trying to do.</p>
  
  <p>I have a DIV pertaining to a textbox for a contact email if a user wants to receive a read receipt. I don't want that box to show unless they check the box.</p>
  
  <p>Checkbox:</p>
  
  <pre><code>     &lt;p id="notifycheck" class="notify"&gt;
      &lt;input id="id_notify" type="checkbox" class="checkbox" name="notify"/&gt;
      &lt;label for="id_notify"&gt;Enable Read Receipts&lt;/label&gt;
    &lt;/p&gt;
    &lt;div id="notify" class="notify"&gt;
      &lt;div id="email_errors"&gt;
      &lt;/div&gt;
  </code></pre>
  
  <p>Textbox:</p>
  
  <pre><code>    &lt;div class="left"&gt;
        &lt;p&gt;
          &lt;label for="email_sender"&gt;Contact email (suggest Anonmail address)&lt;/label&gt;: &lt;br&gt;
          &lt;input id="email_sender" type="text" name="sender_email" size="35" rows="4" maxlength="100"/&gt;
        &lt;/p&gt;
      &lt;/div&gt;
  </code></pre>