How do you just say no?

We’ve opened up a Linux department and I’ve been offered a job. unfortunately I don’t know much about Linux and the hours will suck. I guess it’s for the west coat centers and I’d have to work later swing shifts and be on call a lot of the time. The money is good but I’m just really not interested. However, it would be a good way for me to get to a position that I am interested in so it would bebeneficial for me to go to that department for a while…HMMMM, I just too sure about this one!