ok i add -Djava.library.path=C:\Documents and Settings\Limona\Desktop\lwjgl-2.1.0\lwjgl-2.1.0\native\windows
If you have spaces in your path, you have to enclose it in "", e.g.:
-Djava.library.path="C:\Documents and Settings\Limona\Desktop\lwjgl-2.1.0\lwjgl-2.1.0\native\windows"
I don't use JCreator so I don't really know if this is the right place. The parameter has to be passed to the VM, not your application. Since the classpath parameter is there, it looks like it's the right place.