Problem with javac

Hi, I am using Mircosoft Window. I don't know why I can not use the javac commad. For example, I use the following command: javac myClass.java

It doesn't compile and it gives a message

' javac' is not recognized as an internal or external command, operable program or batch file.

Please help me out with this problem.

Thanks for your attention.

[381 byte] By [goodtoma] at [2007-11-26 15:18:04]