plot log scale on y axis using zoo object (with plot.zoo)

Hi,

I'd like to plot a times series with a log on the y-axis. I'm plotting a zoo
object as it is easier to format the dates on the x-axis. Unfortunately,
log="y" does not work with plot.zoo. Any idea?

Here's a reproducible example

x<-seq(1,10000,length.out=10)
plot(x,log="y",type="l")  #works

z<- zoo(seq(1,10000,length.out=10),
      as.Date(c("1992-01-10", "1992-01-17", "1992-01-24", "1992-01-31",
        "1992-02-07", "1992-02-14", "1992-02-21", "1992-02-28", "1992-03-06",
        "1992-03-13")))
plot(z,log="y")          #gives error

#Warning message:
#In plot.xy(xy.coords(x, y), type = type, ...) :
#  "log" is not a graphical parameter

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