  For J an integral domain and F its field of fractions, we construct a map
from the 3-skeleton of the classifying space for {\Gamma} = SL_2(J[t,1/t]) to a
Euclidean building on which {\Gamma} acts. We then find an infinite family of
independent cocycles in the building and lift them to the classifying space,
thus proving that the cohomology group H2(SL_2(J[t,1/t]);F) is
infinite-dimensional.
