function validate(f) {
	if (f.name.value == "") {
		alert("Please enter your name.");
		f.name.focus();
		return false;
	}
	if (f.emailaddress.value == "") {
		alert("Please enter your email address.");
		f.emailaddress.focus();
		return false;
	}
	if (f.message.value == "") {
		alert("Please enter your message.");
		f.message.focus();
		return false;
	}
}