Titles on panel graphs created in zoo

I have a plotted a stacked panel graph (single x axis and multiple y axis)
using the package zoo and would like to add a title for each separate panel.
I am using the script: 

z <- with(mydata,zoo(cbind(mydata$Water.level,mydata$Submerged.plants,
mydata$Crayfish.CPUE,mydata$Carp.CPUE),Year))

plot(z,type="b",pch=16,lty=2,xlab="Year",ylab=c("Metres","Realtive density",
"CPUE","CPUE"),main="")

Any help would be much appreciated.

M

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