IPCOP ver 1.4.16

i want to install ipcop ver 1.4.16 but in that sys i want to use three lan cards the lan cards which i am using are compatible with PCOP .I have a question is that iwant 2inputs and 1 output . In this 2inputs i want to connect the ISP`S connection .And the third one i want to use for my clients aprox 50-60 sys .the main thing is that i want the 2inputs that if one goes down automaticlly i want the second one to connect IPCop .Just i need to know how the 2inputs colour to be selected and the third one for which colour to be assigned