  Let $A$ be a Hopf algebra in a braided category $\cal C$. Crossed modules
over $A$ are introduced and studied as objects with both module and comodule
structures satisfying a compatibility condition. The category $\DY{\cal C}^A_A$
of crossed modules is braided and is a concrete realization of a known general
construction of a double or center of a monoidal category. For a quantum
braided group $(A,\overline A,{\cal R})$ the corresponding braided category of
modules ${\cal C}_{\cO{A,\overline A}}$ is identified with a full subcategory
in $\DY{\cal C}_A^A$. The connection with cross products is discussed and a
suitable cross product in the class of quantum braided groups is built.
Majid--Radford theorem, which gives equivalent conditions for an ordinary Hopf
algebra to be such a cross product, is generalized to the braided category.
Majid's bosonization theorem is also generalized.
