controlling axes in plot.cuminc (cmprsk library)

Dear R-help list members,

I am trying to create my own axes when plotting a cumulative incidence 
curve using the plot.cuminc function in the CMPRSK library.  The default 
x-axis places tick marks and labels at 0, 20, 40, 60, and 80 (my data has 
an upper limit of 96), whereas I want them at my own specified locations. 
Here is my example code:

library(cmprsk)
attach(MYDATA)

MYCUMINC <- 
cuminc(ftime=TIME,fstatus=STATUS,group=GROUP,rho=0,cencode=0,na.action=na.omit)

plot(MYCUMINC,xlim=c(0,96),ylim=c(0,0.5),xlab="",axes=F)
axis(1,at=c(0,8,16,24,32,48,72,96))

As you can see, I have tried using the "axes=F" parameter that works for 
most plotting functions, but I get the following error message:

Error in legend(wh[1], wh[2], legend = curvlab, col = color, lty = lty,  : 

        unused argument(s) (axes ...)

Is there anyway I can get a customized x-axis when using the plot.cuminc 
function?  I have searched online and R help manuals to no avail and would 
GREATLY appreciate your input.  Please let me know if you need additional 
info from me.

Thanks,
Amy
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