function check_feedback_form() {
	if (!document.feedback_form.spam_check.value) {
	 alert('Please complete the math problem. This is put here to make sure that your are a real person.');
	 return false;
	}
	if (document.feedback_form.spam_check.value != document.feedback_form.spam_ans.value) {
	 alert('The math problem is incorrect. Please try again.');
	 return false;
	}
	if (!document.feedback_form.product_rating.value && !document.feedback_form.product_comments.value) {
	 alert('You have not left any input. Please try again.');
	 return false;
	}
}