function validate () {
	var email = document.getElementById('email');
	var phone = document.getElementById('phone');
	if (email.value == "" && phone.value == "") {
		alert("You must enter either an email address or phone number, so we can get in contact with you about your order.");
		return false;
	}
	return true;
}

_old_onload_ = window.onload;

window.onload = function () {
	if (_old_onload_) _old_onload_();

	document.getElementById('order_form').onsubmit = validate;
}