อยากทราบวิธีทำให้ค่าหายหลังจากกด onclick checkboxมา

<div class="form-group row">
	<div id="REVIEW3" class="col-md-2 ">
	</div>
	<div id="REVIEW3" class="col-md-4 wf-left">
		<div class="checkbox-primary m-l-15">
			<input type="checkbox" id="REVIEW3" name="MED_DOC_REVIEW3" value="1" onclick="putmoney()">
			<label for="vehicle1">ใบเสร็จรับเงิน</label><br>
		</div>
	</div>
	<div id="RECEIPT" class="col-md-2 ">
		<label for="RECEIPT" class="form-control-label wf-right">จำนวน</label>
	</div>
	<div id="REVIEW_RECEIPT" class="col-md-2 wf-left">
		<label class="input-group">
			<input type="text" name="RECEIPT" id="RECEIPT" class="form-control autonumber" value="" 
			data-v-max="9999999999999999999.00" data-v-min="-9999999999999999999.00">
			<small id="DUP_REVIEW_AMOUNT_ALERT" class="form-text text-danger" style="display:none">
			</small>
			<span class="input-group-addon">บาท</span>
		</label>
	</div>
</div>
<script>
	function putmoney(){
		var newsum = document.getElementById("MEDICAL_AMOUNT").value;
		$('input[id=RECEIPT]').val(newsum);
	}
</script>