  Preliminary results are presented from a study of dijet photoproduction in ep
collisions with both virtual and quasi-real photons at the ZEUS detector.
Samples of events with photons of virtuality $P^2$ in the ranges $0.1 < P^2 <
0.55$ GeV$^2$ and $P^2 < 0.02$ GeV$^2$ having two jets of $E_T^{jet} > 4$ GeV
in the final state have been obtained. For both quasi-real and virtual photons,
uncorrected distributions of the quantity $x_{\gamma}^{obs}$, the fraction of
the photon momentum manifest in the two highest $E_T$ jets, are presented.
These distributions are sensitive to the relative contributions of the direct
and resolved processes. Resolved photon processes are evident in both data
sets, with an apparent decrease in the relative contribution from resolved
processes as photon virtuality increases.
