title: Check if any checkbox in form is checked (MooTools)
body: <p>I'm using a form with various checkbox groups and I would like the next button at the bottom of the page to appear only if any of the checkboxes is checked. </p>
  
  <p>I found a working solution using jQuery here: </p>
  
  <pre><code>var checkboxes = $("input[type='checkbox']"),
  submitButt = $("input[type='submit']");
  
  checkboxes.click(function() {
  submitButt.attr("disabled", !checkboxes.is(":checked"));
  });
  </code></pre>
  
  <p><a href="http://jsfiddle.net/BPhZe/1937/" rel="nofollow">http://jsfiddle.net/BPhZe/1937/</a> </p>
  
  <p>I'm looking for a way to do this with MooTools and I would prefer a solution where the button state is not "disabled" but hidden via CSS.</p>