[Zope] Calendar tag question - width of calendar table

Is it true that I have to modify the calendar product (calendarTag.py) file in order to allow setting the width of the calendar to what I want? I want to ensure that the calendar occupies a % of a particular screen and it looks like it doesn't have a means to do that as is. That is, there is no table width attribute. I have calendar 1.0.4.