title: jquery, unselect checkbox by value
body: <p>i have many checkbox:</p>
  
  <pre><code>    &lt;input type="checkbox" name="checkbox_user" value = "1"/&gt;
      &lt;input type="checkbox" name="checkbox_user" value = "2"/&gt;   
      &lt;input type="checkbox" name="checkbox_user" value = "3"/&gt;
  ...
  </code></pre>
  
  <p>and checkbox with value 2 is selected. Is possible unselect checkbox (with jQuery) when i now only value.</p>