wiring arduino to ir emitter and reciver

Hi all, i would like to wire the arduino to a couple of emitter and recive ir led like these:
http://www.robot-italy.com/images/images_big/700241.jpg
Somebody know how to do it?
Maybe just like a led and a ldr?
Thanks.

Will need to know what they are besides what they look like. Any link to the part? The picture infers photo-transistors/IR leds

Here is the section you want to read up on:

http://arduino.cc/playground/Main/InterfacingWithHardware#light_sensor