R help - May 2012 - Multiple plots

I have a variable : 
*sim.var[,1]
*
Object of class SpatialPixelsDataFrame
Object of class SpatialPixels
Grid topology:
     cellcentre.offset cellsize cells.dim
Xloc               0.3     0.05        97
Yloc               0.1     0.05       117
SpatialPoints:
        Xloc Yloc
   [1,] 0.30 1.70
   [2,] 0.35 1.70
   [3,] 0.35 1.75
   [4,] 0.40 1.70
   [5,] 0.40 1.75
   [6,] 0.40 1.80
   [7,] 0.40 1.85
   [8,] 0.40 1.90
   [9,] 0.40 2.10
  [10,] 0.40 2.15
  [11,] 0.40 2.20
  [12,] 0.40 2.40
  [13,] 0.40 2.45


and a variable :
*sim.mean[,1]*
Object of class SpatialPixelsDataFrame
Object of class SpatialPixels
Grid topology:
     cellcentre.offset cellsize cells.dim
Xloc               0.3     0.05        97
Yloc               0.1     0.05       117
SpatialPoints:
        Xloc Yloc
   [1,] 0.30 1.70
   [2,] 0.35 1.70
   [3,] 0.35 1.75
   [4,] 0.40 1.70
   [5,] 0.40 1.75
   [6,] 0.40 1.80
   [7,] 0.40 1.85
   [8,] 0.40 1.90
   [9,] 0.40 2.10
  [10,] 0.40 2.15
  [11,] 0.40 2.20

If I plot these variables with:
*spplot(sim.var[,1],main="var")*
and 
*spplot(sim.mean[,1],main="mean")*

it works.

But how can I plot these two variables together with a single scale?

Thanks


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