Netscape Communicator 4.5P2 on a UNIX machine (Linux, SunOS, HPUX are reported to be affected) doesn't appear to "really" disable JavaScript even though you disable it via the Preference Menu.
Netscape Communicator 4.5P2 doesn't appear to check the state in which the JavaScript check box is set to in the preferences menu, and thus allowing JavaScript to run even though it was explicitly disabled.