[R] legend position in interaction.plot

[Peter Maclean]

How do I move the legend from default position (right and within the plot) to the "bottomleft" of the plot?
 
interaction.plot(YEAR, ID GROWTH, legend=TRUE, col = 2:7,xlab="Year", 
       ylim=c(0,2), ylab="Growth",leg.bty = "o")

Peter Maclean
Department of Economics
UDSM