How to email IP and browser type on page load

Hi all i am kind of new to php. I wonder how i can email user ip address and browser type on page load. What i mean is once a page loaded on visitor browser it sends me the administrator of a site an email with ip address of visitor and browser type . I be happy if an expert help me achiving this task.Thanks

http://us2.php.net/manual/en/ref.mail.php <-- Mail function so you know how to send the email.

http://us3.php.net/reserved.variables <-- Shows how to get environment variables including IP address and Web Browser, among others.