  We calculate spectral functions associated with hadronic current correlation
functions for vector currents at finite temperature. We make use of a model
with chiral symmetry, temperature-dependent coupling constants and
temperature-dependent momentum cutoff parameters. Our model has two parameters
which are used to fix the magnitude and position of the large peak seen in the
spectral functions. In our earlier work, good fits were obtained for the
spectral functions that were extracted from lattice data by means of the
maximum entropy method (MEM). In the present work we extend our calculations
and provide values for the three-momentum dependence of the vector correlation
function at $T=1.5T_c$. These results are used to obtain the correlation
function in coordinate space, which is usually parametrized in terms of a
screening mass. Our results for the three-momentum dependence of the spectral
functions are similar to those found in a recent lattice QCD calculation for
charmonium [S. Datta, F. Karsch, P. Petreczky and I. Wetzorke,
hep-lat/0312037]. However, we do not find the expontential behavior in
coordinate space that is usually assumed for the spectral function for $T>T_c$
and which allows for the definition of a screening mass.
