[R] rpart: plot without scientific notation

[Jay]

While I'm very pleased with the results I get with rpart and
rpart.plot, I would like to change the scientific notation of the
dependent variable in the plots into integers. Right now all my 5 or
more digit numbers are displayed using scientific notation.

I managed to find this:
http://tolstoy.newcastle.edu.au/R/e8/help/09/12/8423.html
but I do not fully understand what to change, and to what.