Как включить кнопку, когда в JavaScript выбран флажок


<input onclick="alert('thank you for agreeing to the terms and conditions')" type="submit" name="sendNewSms" class="inputButton" id="sendNewSms" value=" i agree to the terms and conditions " />

<input type="checkbox"  onchange="document.getElementById('sendNewSms').disabled = !this.checked;" />
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