Brand image change

Hi everyone ,

                      Last day there was a schenerio related to logon page customozation, which is specifically about brand image change. The schenerio is somethong like this, its about TATA groups portal and they asked me is it possible to see the diffrent logo image for TATA CMC, TCS, TATA STEEL in the same server, if yes then how ?

                     Would you provide the solution to fix this one.

Thanks,

Regards,

NAND kumar Yadav