Web2 style secure & flexible free php contact form with easy setup

This a small and powerful contact form, which protected with a random colored captcha. You can start to use it with changing just ADMIN_EMAIL. You can easily add-remove contact fields like name, email, homepage, phone number, fax, address, subject, message etc. You can easily set required fields, which visitors must fill. Required fields are red marked when visitors try to send form with empty values. It is flexible; you can change filename or include it in your cms modules. Because of more security it uses session for validation not cookies. There is also a small brute-force protection included. A small donation or backlink wished but not required. Demo in action! (Download link is below) Code of PHP-File: