function email_check(address)
{
	re = /^[^.]+(\.[^.]+)*@([^.]+[.])+[a-z]{2,3}$/;
	return address.search(re) == 0;
}

function email_form_check()
{
	var email_ok = email_check(self.document.forms.f.email.value);
	if (! email_ok) {
		alert("Please enter valid e-mail address.");
	}
	return email_ok;
}