title: Check different radio buttons at the same time with jquery
body: <p>I have two groups of radio buttons.
  I would like to when I click in one buttom of a group, select automaticaly the corresponding button in the another group at the same time. How I do that with jquery? I tried many ways, no success.</p>
  
  <pre><code>&lt;input type="radio" name="RadioGroup1" value="A" id="A"&gt;A
  &lt;input type="radio" name="RadioGroup1" value="B" id="B"&gt;B
  &lt;br&gt;&lt;br&gt;
  &lt;input type="radio" name="RadioGroup2" value="A1" id="A1"&gt;A1
  &lt;input type="radio" name="RadioGroup2" value="B1" id="B1"&gt;B1
  
  &lt;script&gt;
    $('input:radio').change(function(){
      // if check A, check A1 too
      // if check B, check B1 too
      // if check A1, check A too
      // if check B1, check B too
     })
  &lt;/script&gt;
  </code></pre>
  
  <p>Here´s the jsfiddle: <a href="http://jsfiddle.net/F9LYL" rel="nofollow">http://jsfiddle.net/F9LYL/</a></p>