old CD's on new iBook

Hi! We got our new iBook recently with OSX (Tiger). When I try to run a CD that we used to use with our old iMac, I am told that I need Classic to run the CD. Do you suggest that I install Classic in my brand-new iBook??? That seems absurd. But so does replacing all our CD's. (I'm talking about mostly educational and game CD's)
Suggestions? Thanks!