Default Mount Two Roms - ICS + JB

Do you Know how to mount two roms?..I wanted jelly bean on my Samsung Galaxy S Duos s7562..But Samsung Never gave update for this phone ..INSTEAD they launched new phone called Samsung Galaxy S Duos 2 s7582....Will You Please Mix Or Do something with these roms so that i can Get it worked on My S duos...Please...

Regards
Sreekant Shenoy