jdk version

[Suresh Ajja]

 Now recently i installed Jbuilder 4.0, which took jdk1.3 as default jdk
ver.in built in it.from command prompt, I was not able to run my programs,
hence I installed jdk1.2 after that, but now I am not able to run my Inprise
server (jdk1.2.2 or later ver. not found error) .can somebody tell me How
can i configure only one ver. of jdk to run my IAS as well from Command pr.
Help needed.
Suresh