select cu_id from customer where cu_email = '' and cu_active = 1 order by cu_id desc
			<script type="text/javascript">
			parent.document.getElementById('tx_bill_email').style.backgroundColor = '#ffffff';
			parent.document.getElementById('tx_bill_email_exists').innerHTML = '';
			parent.document.getElementById('tx_bill_email_exists').style.display = 'none';
			</script>