problem with compilig java code into the windows CMD

when ever I try to compile java code written in the standard Windows XP Notepad using the commmand promt, I get a funny error: "javac is not recognized as an internal instruction or batchfile!"
Please understand that I'm a noob in this area and if i made a mistake, feel free to point it out to me!

What shall I do?

P.S. I know i should use an Java integrated envoirment but since this is homework for the school, I'm forced to use the old fashion way.

Thank's anticipated !

CCH, don't hijack existing threads with your own problems. it wasn't even
in the proper forum - Java is NOT javascript.
also stop digging old threads - we appreciate your efforts to help, but please
do this in the newer threads where help is more required.
now for your problem: "javac" is not internal windows command, you have
to give full path e.g. "C:\MyJavaFolder\javac.exe myjavafile.java"