VOlume control with proximity sensor

Hello everyone I'm new in Arduino, my project is adjusting volume of a video according to the proximity of the viewer in a booth.
I need help with everything including hardware and coding.
Please help me complete this project!
Thanks.

What is it about today why do new posters not even read the forum before posting.

DO NOT CROSS POST IT PISSES US OFF >:( >:( >:(

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1291145422