[R] double-axis labels function of each other

[Hurr]

I have been doing other things, but want again to learn R.
First some code:

#try 2 axes at bottom
x1 <- c(1,2,3,4,5,6,7,8,9)
x2 <- c(5,1,9,6,3,7,8,2,4)
plot(x1,x2,type="l") #scatter plot x1 on horizontal, x2 on vertical axis
axis(1,labels=TRUE,tick=TRUE,col="red",col.axis="red",lwd=4,line=2.5)

Some simple questions:
1)How do I make it put the value 1/HorizScaleValue at the lower axis ticks?
2)How do I give more space at the bottom for the lower axis?
3)How do I make the two X axes the same length?




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