  The trigonometric quantized Knizhnik-Zamolodchikov equation (qKZ equation)
associated with the quantum group $U_q(sl_2)$ is a system of linear difference
equations with values in a tensor product of $U_q(sl_2)$ Verma modules. We
solve the equation in terms of multidimensional $q$-hypergeometric functions
and define a natural isomorphism between the space of solutions and the tensor
product of the corresponding evaluation Verma modules over the elliptic quantum
group $E_{\rho,\gamma}(sl_2)$, where parameters $\rho$ and $\gamma$ are related
to the parameter $q$ of the quantum group $U_q(sl_2)$ and the step $p$ of the
qKZ equation via $p=e^{2\pii\rho}$ and $q=e^{-2\pii\gamma}$.
  We construct asymptotic solutions associated with suitable asymptotic zones
and compute the transition functions between the asymptotic solutions in terms
of the dynamical elliptic R-matrices. This description of the transition
functions gives a connection between representation theories of the quantum
loop algebra $U_q(\widetilde{gl}_2$ and the elliptic quantum group
$E_{\rho,\gamma}(sl_2)$ and is analogous to the Kohno-Drinfeld theorem on the
monodromy group of the differential Knizhnik-Zamolodchikov equation.
  In order to establish these results we construct a discrete Gauss-Manin
connection, in particular, a suitable discrete local system, discrete homology
and cohomology groups with coefficients in this local system, and identify an
associated difference equation with the qKZ equation.
