def drawShadowPoke(bitmap,color=nil)
  blankcolor=bitmap.get_pixel(0,0)
  shadowcolor=(color ? color : blankcolor)
	colorlayer=Bitmap.new(bitmap.width,bitmap.height)
  colorlayer.fill_rect(colorlayer.rect, shadowcolor)
  bitmap.blt(0,0,colorlayer,colorlayer.rect,113)
  shadowcolor=bitmap.get_pixel(0,0)
  for x in 0...bitmap.width
    for y in 0...bitmap.height
      if bitmap.get_pixel(x,y)==shadowcolor
        bitmap.set_pixel(x,y,blankcolor)
      end
    end
  end
end