search after an infra red net

[robota]

Hallow friends
I want to buy an infra red net that I can put over the window and connect it to the controller and if the robot pass the window he receive a "message" that tell he pass the window
Where I can buy an infra red net like this ?
thanks
robota

[SmAsH]

wait, so do you just want the robot to know when its passed the window? you could just put an infared led on the window and an infared detector on your robot.