controllerman

Hi. i want to check my battery status by using the circuit which i have attached.I am using 12v 4.5Ah battery.when i fully charge the battery it gives more than 12v.What i exactly want is that when battery voltage is 12.5v all the LED's will be ON.when battery volts becomes 12v two LED's will be ON,when battery volts becomes 11.5 one LED will be ON and if battery volts becomes less than 11.5v No LED will be ON.Reference voltage i am using is 5v. My question is that how i find the values of resistances so that when voltage of battery increases/decreases then LED's will light up accordingly. thanks