  We analyze the Josephson current in a junction consisting of two
superconductors (S) and a ferromagnetic layer (F) for arbitrary impurity
concentration. In addition to non-magnetic impurities, we consider also
magnetic ones and spin-orbit scattering. In the limit of weak proximity effect
we solve the linearized Eilenberger equation and derive an analytical
expression for the Josephson critical current valid in a broad range of
parameters. This expression enables us to obtain not only known results in the
dirty and clean limits but also in a intermediate region of the impurity
concentration, which may be very important for comparison with experimental
data.
