scatter plot

I'd like to do a simple scatter plot but instead of using the variable 
values on the X axis I would like to plot the percentiles. I searched in 
the manual for percentiles but did not find what I was looking for. I've 
been using SAS for several years but I new to R.

Dean Sonneborn
Programmer Analyst
Department of Public Health Sciences
University of California, Davis
(916) 734-6656