javascript - Enabling Submit Button after clicking checkbox -

i have been struggling getting following code work (example taken jsfiddle after looking @ responses in forum.

can see i'm going wrong?

<script type="text/javascript">        var checkboxes = $("input[type='checkbox']"),      submitbutt = $("input[type='submit']");    checkboxes.click(function() {      submitbutt.attr("disabled", !checkboxes.is(":checked"));  });        </script>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js"></script>  <h1>button should enabled if @ least 1 checkbox checked</h1>    <form>      <div>          <input type="checkbox" name="option-1" id="option-1"> <label for="option-1">option 1</label>      </div>      <div>          <input type="checkbox" name="option-2" id="option-2"> <label for="option-2">option 2</label>      </div>      <div>          <input type="checkbox" name="option-3" id="option-3"> <label for="option-3">option 3</label>      </div>      <div>          <input type="checkbox" name="option-4" id="option-4"> <label for="option-4">option 4</label>      </div>      <div>          <input type="checkbox" name="option-5" id="option-5"> <label for="option-5">option 5</label>      </div>            <div>          <input type="submit" value="do thing" disabled>      </div>  </form>