  An interplay of optical lattices and nonlinear impurities in controlling the
dynamics of Bose-Einstein condensate bright solitons is investigated using
effective potential approach. The ability of pushing the solitons into or away
from the impurity region by changing both lattice and impurity parameters is
suggested. A possibility for the existence of stable fundamental gap solitons,
which appear to satisfy an inverted Vakhitov-Kolokolov criterion, is examined.
