cant's compile with javac

Hi, whenever I try to compile something with javac from the command
prompt (windows XP) i get the following error:
Exception in thread "main" java.lang.NoClassDefFoundError:
com/sun/tools/javac/Main

even if I just write "javac" without a file to compile i get the same
error.
The only time when i works correctly is when I'm in the bin directory
that contains javac, the i can compile everything. If i change to a
different directory it doesn't work and i get the afordmentioned error.
one more thing - when i compile from eclipse it works, i only get it
when manually compiling for the command prompt.
I'm using version 1.5 update 5 (the last one) but it happened with
earlier versions as well (1.5 update 1, update 2, etc..)

Thanks in advance for your help.

.

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