OK, doc says:
If you get an error message about the BASE_DIR needing to be set manually, un-comment the line near the top of calendar.pl and calendar_admin.pl starting with $BASE_DIR= and set it to be the local file system path of the 'calendarscript' directory (NOT the web server path!).
This is the error message I get when I try the calendar.pl. The problem is I'm using Tripod, and I don't think I can get the local file system path. How can I get around this?