  The spin-1 ferromagnetic Blume-Capel film with an alternating crystal field
$\Delta=\Delta_1$ on the odd layers and $\Delta=\Delta_2$ on the even ones is
considered in the mean field approximation. The ground state phase diagrams in
the ($d_1,d_2$) plane ($d_1=\Delta_1/J$ and $d_2=\Delta_2/J$) are determined
analytically; the number of their phases depends on the parity of the number of
layers of the film. At finite temperature, fifteen types of topology, depending
on the range of variation of $d_1$, are found in the (t,$d_2$) plane for an
even number of layers, but only fourteen for an odd number of layers. The phase
diagrams exhibit a variety of multicritical points. In particular, a
tricritical point C appears in the paramagnetic-ferromagnetic line of
transition, but only for values of $d_1$ larger than a threshold value
$d_{trc}^{(2)} ={8 \ln 2 \over 3}$ which is but the tricritical crystal field
(in the mean field approximation) of the spin-1 Blume-Capel model on a square
lattice. Moreover, lines of transition presenting the reentrant and double
reentrant behaviors may also take place.
