how to qplot two x-axis x1:Farenheit x2:Celsius

Hi,

how can i plot two different x axis in a ggplot2 qplot?
I want to plot Farenheit and Celsius in one diagram.
x1:Farenheit x2:Celsius

Hi Jason,
Here's a basic example of how to do this sort of thing.

degC<-seq(-40,120,by=20)
plot(degC,1:9)
axis(3,at=degC*1.4+32)
mtext("degF",3,line=2)

Jim