show.colors <- function(x=22,y=30){
   par(mai=c(.4,.4,.4,.4), oma=c(.2,0,0,.2))

   plot(c(-1,x),c(-1,y), xlab='', ylab='', type='n', xaxt='n', yaxt='n', bty='n')
   for(i in 1:x){for(j in 1:y){
         k <- y*(i-1)+j ; co <- colors()[k]
         rect(i-1, j-1, i, j, col=co, border=1)}}
   text(rep(-.5,y),(1:y)-.5, 1:y, cex=1.2-.016*y)
   text((1:x)-.5, rep(-.5,x), y*(0:(x-1)), cex=1.2-.022*x)


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