title: Allow to click a link if a radio button is checked
body: <p>I'm searching for a solution that lets users click on links only if the radio buttons are checked. Otherwise it should a message should appear (popup).</p>
  
  <p>Here is my code:</p>
  
  <pre><code>&lt;div id="rightnav"&gt;
          &lt;a href="katan_checklist_walkaroundcheck.html"&gt;Next&lt;/a&gt;&lt;/div&gt;
  &lt;/div&gt;
  
  &lt;li class="radiobutton"&gt;&lt;span class="name"&gt;Struct. Temp. Indic.&gt; 38°C -not exceed 55°C&lt;/span&gt;
              &lt;input name="1" type="radio" value="other" /&gt;&lt;/li&gt;
              &lt;li class="radiobutton"&gt;&lt;span class="name"&gt;Airplane Documents - check &lt;/span&gt;
              &lt;input name="2" type="radio" value="other" /&gt;&lt;/li&gt;
              &lt;li class="radiobutton"&gt;&lt;span class="name"&gt;Flight Control Lock - removed&lt;/span&gt;
              &lt;input name="3" type="radio" value="other" /&gt;&lt;/li&gt;
  ...
  </code></pre>