contourplots

Hi
Silly question maybe, but I am only a novice.
How do I make the background of contourplot white? I have tried bg, 
canvas, and all other possible option suggested under par and xyplot. 
But nothing seems to work. Since my plot is of data in x-y space maybe I 
could use another function (i.e. contour), but than x and y should be 
ordered and I haven't figured out how to do that yet.

Any suggestions?
Willem

Dr R.W. Vervoort
McCaughey Senior Lecturer Hydrology and Catchment Management			
Faculty of Agriculture, Food and Natural Resources
Rm 503, Watt Bldg.
http://www.agric.usyd.edu.au/mccaughey

Postal:
Bldg A03
The University of Sydney, NSW, 2006

phone: +61 (2) 9351 8744
fax:   +61 (2) 9351 5108
e-mail: w.vervoort at acss.usyd.edu.au