the link i had given you above… i had shown interfacing for one IR pair same way you can do it for other two and its upto you, where you want to interface. just write your code according to that.
just go for the links below the ir interfacing is very beutifully explained.
http://www.engineersgarage.com/electronic-circuit/infrared-ir-sensor
http://www.engineersgarage.com/microcontroller/8051projects/distance-measure-IR-ADC0804-AT89C51