HELP! I've installed, but I can't compile yet....why?

I've already downloaded and installed the J2SDK files for my computer. I went into DOS and tried to compile a program. the reply was 'invalid command'. I'm not brand new to the language, but this is the first time downloading it on my own computer (I use it mainly on school computers). Can someone tell me what else I need to do?

Go here and follow the instructions for updating the Path.
http://java.sun.com/j2se/1.4.1/install-windows.html

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