function validateForm() {
	if (document.getElementById('quote-form').email.value == '' && document.getElementById('quote-form').phone.value == '')
		return showError('Please enter either an e-mail address or a phone number.');
	if (document.getElementById('quote-form').firstname.value == '')
		return showError('Please enter your first name.');
	if (document.getElementById('quote-form').lastname.value == '')
		return showError('Please enter your last name.');
	
	return true;
}

function showError(errormessage) {
	alert(errormessage);
	return false;
}