Found the answer to the background myself: 'trellis.par.get' and 'trellis.par.set'
background<-trellis.par.get("background")
background$col<-"white"
trellis.par.set("background", background)
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
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