  Josephson vortices are imaged magneto-optically due to their decoration with
pancake vortices in $Bi_{2}Sr_{2}CaCu_{2}O_{8+d}$ single crystals.
Peculiarities of interaction between the pancake and Josephson vortices (JV)
depending on the values of crossing fields and temperature are studied based on
the observations of these decoration patterns. Evidences of the period-doubling
in the decoration patterns compared to the JV stack period, migration of JV
lines between neighboring stacks, and transitions between different JV
configurations are reported. Imaging of the pancake/Josephson vortex decoration
patterns over large areas is shown to be a sensitive tool for detecting local
variations of the anisotropy and mapping imperfections in layered HTS samples.
