I don't really understand how defining larger values will result in a smaller printout

Me neither, but it might have some effect on the text being unreadable -- if you start up notepad and try specifying font size as zero or negative , I get something quite unreadable. If you use font sizes smaller than default but still readable, it might work :/

BTW the constructor for $htmlwindow is in the initialization subroutine.

:) yes, I assumed as much, but that doesn't help the code run on my computer