function getMailAddress(username, lowercase) {
	if (lowercase) {
		var postfix = '@' + 'huadun' + 'soft' + '.com';
		username = username.toLowerCase();
	} else {
		var postfix = '@' + 'huadun' + 'soft' + '.com';
	}
	return (username + postfix);
}
function printMailAddress(username) {
	document.write(getMailAddress(username, false));
}