Simple online database lookup

The database would be a simple local You would go to the website where it would ask you to enter a first name, last name and customer number. If what you entered matched exactly what is in the database there would be a green background page with the information entered saying it is valid. If it is not a red page with invalid would come up. If you entered information that did not exactly match the information in the database it would bring up a black page saying No information found. To stop people from brute forcing the database, I would like to put a CAPTCHA or a time limited (per ip) lockout after 2 wrong attempts (with the page coming up to tell them)