function chkVaccination ( value ) {
	if ( value == "y" ) {
//		document.getElementById('trQ4Y').style['visibility'] = 'visible';
		document.getElementById('trQ4Next').style['visibility'] = 'visible';
		document.getElementById('trQ4NextMail').style['visibility'] = 'visible';
//		document.getElementById('trQ4N').style['visibility'] = 'hidden';
	} else if ( value == "n" ) {
//		document.getElementById('trQ4Y').style['visibility'] = 'hidden';
		document.getElementById('trQ4Next').style['visibility'] = 'hidden';
		document.getElementById('trQ4NextMail').style['visibility'] = 'hidden';
//		document.getElementById('trQ4N').style['visibility'] = 'visible';
	} else {
//		document.getElementById('trQ4Y').style['visibility'] = 'hidden';
		document.getElementById('trQ4Next').style['visibility'] = 'hidden';
		document.getElementById('trQ4NextMail').style['visibility'] = 'hidden';
//		document.getElementById('trQ4N').style['visibility'] = 'hidden';
	}
}