Help setting Class Path

hi,
I just downloaded and installed JDK 5 update 7 and need help setting the class path. Can someone give me instructions on how to do this in windows XP please.
Cheers

thanks for the replies guys.
I'm still having problems. What I want to be able to do is compile a .java file using the Command Prompt in windows XP.
Currently, when I type javac I get the message:
'javac' is not recognized as an internal or external command, operable program or batch file.I set the classpath to C:\jdk1.5.0_07\bin\ but when I type path in the command prompt this path doesn't appear.
If I change the directory in the command prompt to C:\jdk1.5.0_07\bin\ then type javac it works (I get a list of commands) but I need it to work from within any folder.
Have I set the classpath incorrectly or is it something else?
Thanks

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Imm new to Java Techology...plz tell me in detail bout how to "Set Class path", ....In Detail...Bye

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