function noIata(checkbox) {
	if(checkbox.checked) {
		phone = $('Phone');
		if(phone.value.replace(/[\(\)-\. ]*/g,'') != '') {
			iata = $('IATA');
			iata.readOnly = true;
			iata.value = phone.value.replace(/[\(\)-\. ]*/g,'');
		} else {
			alert('Please fill in your phone number before checking this box.');
			checkbox.checked = false;
		}
	} else {
		iata = $('IATA');
		iata.readOnly = false;
		iata.value = '';
	}
}