title: checkbox onchange firing twice
body: <p>I'm attaching an <code>onchange</code> event on checkboxes like this:</p>
  
  <pre><code>$("input[type='checkbox'][name='auswahl[]']").on("change", function() {
      alert($(this).attr("id") + ' ' + $("label[for='" + $(this).attr("id") + "']").text() + $(this).attr("checked"));
  });
  </code></pre>
  
  <p>The checkboxes look like this:</p>
  
  <pre><code>&lt;input type="checkbox" name="auswahl[]" id="aus_nunatsiaqnews_ca"&gt;&lt;label for="aus_nunatsiaqnews_ca" title="Canada"&gt;Nunatsiaq News&lt;/label&gt;
  </code></pre>
  
  <p>Unfortunately the event is firing twice. When I isolate the code given above and put it on a test page everything is fine and the event is firing only once.
  Need help.</p>