Filetype specificity for menus

I'm using vim 7.3 Huge Gtk2-gnome gui, on ubuntu 12.04.

I've used vim for many years but have not figured out how to do the
following :

Make a menu item coded for a specific filetype *not* be present in a
buffer of a different filetype.

Example : with python.vim, a menu for python-specific actions is
installed. Switching to a javascript buffer, the python menu
remains. It would be great if it were to go away.

thanks
--
Tim
tim at tee jay forty nine dot com or akwebsoft dot com
http://www.akwebsoft.com, http://www.tj49.com

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