\colalign
and
\rowalign
\array{ 1 & 2 & A & D & xyz \\ \cellopts{\rowalign{bottom}} y & \cellopts{\rowalign{center}} y & y & \frac{\frac{1}{2x^2}}{\frac{x+1}{5}} & \cellopts{\rowalign{top}}y \\ 8 & 4 & 5 & 5001 & 12\\ 7 & yjq & G & 2001 & y }
\array{ x+y+z & e^x \\ \cellopts{\colalign{left}} 3 & 4 \\ \cellopts{\colalign{center}} \beta & \Gamma \\ \cellopts{\colalign{right}} 7 & yjq }More information on these commands may be found in Sec. 7.2.3 of the WebTeX documentation.
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