[R] y label after axis (4)

[umeno]

Hi,

I am trying to figure out how to lable the second y-axis after the following 
codes:

plot(x, y,
	xlab="time",
	ylab="pay1"
	)
par(new=TRUE)
plot(x,y2,
	ann=FALSE,
	xaxt="n",
	yaxt="n",
	pch=7
	)
axis(4)

Then, I want to label the second y axis "pay2".  I tried "title(ylab="pay2")", 
but it put this lable on the first y-axis.  Does anyone know how to move this 
to the second y-axis?

Thank you
Soyoko

______________________________________
Ms. Soyoko Umeno
Graduate Research Assitant for the Illinois-Missouri Biotechnology Alliance (IMBA) at http://www.imba.missouri.edu/
Ph.D. Student at the Department of Agricultural and Consumer Economics
at the University of Illinois at Urbana-Champaign
Office Phone: 217-333-3417 or 217-333-0364
Fax: 217-244-4817
Mailing Address: 1301 W. Gregory Dr. MC710, Urbana, IL 61801