Question: coloring lines in contourplot

Hi, I want to draw the contourplot of this two family of lines x*y and x*y^2. with(plots): contourplot( {x*y, x*y^2}, x=0..10, y=0..20); I would like that the first function (x*y) is colored in red ad the secod (x*y^2) in blue. How could I do it? I tried with "colouring= [red, blue]" but the coloring is not what I want. Thanks in advance for the help. JJ (By the way..I wish you the best to all of you during 2006!!)
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