function Mcheck(){
	if (document.mailform.name.value=="") {
	window.alert("A name is non-input.");
	return false }

	if (document.mailform.email.value=="") {
	window.alert("A mail is non-input.");
	return false }

	if (document.mailform.comment.value=="") {
	window.alert("A comments is non-input.");
	return false }
}