Website on sd card and read data for pwm

Hello and tnx for this forum, i learn many usefull things from it. But i have a problem, i know how to make webpage in html , put it on sd card and display what is on it , now i have a problem to read with arduino what i type in a html form to controll pwm of 2 pc fan, i cant find it anyware. This guy ( http://efxa.org/2012/10/22/arduino_web_controller/ ) made exactly what i want but is for Arduino Duemilanove and because i am new to arduino i cant modify the code to work.

Please can you give me some advice?

Thank you,