title: jQuery radio button select only one (ID)
body: <p>I have 2 groups raido buttons, they have different unique IDs, how to make they can be selected only one for each group. Thanks</p>
  
  <pre><code>&lt;group&gt;
  &lt;input type="radio" id="u1"/&gt;1
  &lt;input type="radio" id="u2"/&gt;2
  &lt;input type="radio" id="u3"/&gt;3
  &lt;/div &gt;
  &lt;/group&gt;
  
  
  &lt;group&gt;
  &lt;input type="radio" id="T1"/&gt;4
  &lt;input type="radio" id="T2"/&gt;5
  &lt;input type="radio" id="T3"/&gt;6
  &lt;/group&gt;
  </code></pre>
  
  <p><a href="http://jsfiddle.net/pZdWu/" rel="nofollow">http://jsfiddle.net/pZdWu/</a></p>
  
  <p>I don't want to change the html, just want to use jQuery to achieve </p>