SOLVED: Re: Changing gird marks in ggplot2

Hi,
When I zoom into a graph created in ggplot2 with the
coord_cartesian(ylim=c(0,5)) option, I have no values labelled on my
y-axis. For this graph ggplot2 only puts labels the y-axis at
intervals of 10 (i.e. 0, 10, 20, ...). However, the major portion of
the graph I am interested in is located between the values of 0 and 5
on the y-axis (thus why I am zoooming). How can I coerce ggplot2 into
making the major gird marks so that 0, 1, 2, 3, 4, and 5 are shown as
it is currently showing no label?
Thanks. Also please cc me directly as I'm a digest subscriber.
Chris