  We investigate bright matter-wave solitons in the presence of a spatially
varying scattering length. It is demonstrated that, even in the absence of any
external trapping potential, a soliton can be confined due to the inhomogeneous
collisional interactions. Moreover we observe the enhanced transmission of
matter-wave solitons through potential barriers for suitably chosen spatial
variations of the scattering length. The results indicate that the manipulation
of atomic interactions can become a versatile tool to control the dynamics of
matter waves.
