Question: Plotting a graph of two variables?

I want to plot a graph for the two variable function f(x,y)= xy^2/(x^2 + y^2 +1 )

over the region x = [-2,2] and y = [-2,2].

How I can create a coloured [or with different shades of grey to see the difference in a black and white printout] "contour" plot of this function over the same reagion? Using 8 contours and in such a way that it is illustrative of the surface. How I can also identify the colours [shades of grey] that correspond to the highest and lowest elevations.

I need that in maple 12. I hope someone can help me with that.

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