function checkform() {
	var error = '';
	if (document.getElementById('ucode').value == '') error = 'The antispam code is required';
	if (document.getElementById('comment').value == '') error = 'Your comment is required';
	if (document.getElementById('author').value == '') error = 'Your name is required';
	if (error == '') {
		document.getElementById('cform').submit();
	} else {
		alert (error);
	}
}