function updateSubject(field) {
	
	var selects = document.getElementsByTagName("select");
	
	for (var i=0;i<selects.length;i++) {
		switch(selects[i].name) {
			case "checkin-day":
				var day = selects[i].value;
				if (day == "") {
					day = "XX"
				}
				break
			case "checkin-month":
				var month = selects[i].value;
				break
			case "checkin-year":
				var year = selects[i].value
				break
		}
	}
	
	var date = year+"-"+month+"-"+day;
	var dateformat = /^\d{4}-\d{2}-(\d{2}|XX)$/;
	var subject = document.getElementById("subject");
	if (dateformat.test(date)) {
		subject.value = date+" - CLA Enquiry Form"
	}
	else {
		subject.value = "CLA Enquiry Form"
	}
		
}