function onCountryChange(countryField) {
	var country = countryField.value;
	if (country == 'USA') {
		showField('USstate');
		hideField('state');
	} else if (country == 'Australia') {
		showField('state');
		hideField('USstate');
	} else {
		hideField('state');
		hideField('USstate');
	}		
}

function showField(name) {
	document.getElementById('form_'.concat(name)).style.display='block';
	document.getElementById('form_label_'.concat(name)).style.display='block';
}

function hideField(name) {
	document.getElementById('form_'.concat(name)).style.display='none';
	document.getElementById('form_label_'.concat(name)).style.display='none';
}

addLoadEvent(function() { onCountryChange(document.getElementById('form_country')) });