I designed a calendar in Publisher, and exported it as
HTML. Because the file is so complex, it made the entire
thing into an image and then referenced the image in the
HTML file.

Now, whenever the page is viewed, the image is resized to
fit the browser screen. I like this, because otherwise it
would be huge. The problem is that the resolution is
lowered and lines in-between days begin to disappear. The
problem does not lie in the image itself, because you can
download the image and all lines will be in tact.

If you go to this URL, it will help you understand the problem:
http://www.spiritaliveon65.org/pages/calendar.html

Can this be corrected without changing the .pub file? Is
there a Publisher setting or even an HTML Tag/JAVA code I
can use?

Thanks