  We consider graphs Sigma^n in R^m with prescribed mean curvature and flat
normal bundle. Using techniques of Schoen, Simon and Yau, and Ecker-Huisken, we
derive an interior curvature estimate of the form |A|^2<=C/R^2 up to dimension
n<=5, where C is a constant depending on natural geometric data of Sigma^n
only. This generalizes previous results of Smoczyk, Wang and Xin, and Wang for
minimal graphs with flat normal bundle.
