There are some things you can do to help get a
good print-out of the map.

You have a better chance if you download the
graphic and print it separately from the web
page.  To do that, you have to right-click over
the map and select "Save Picture as..." (if using
Internet Explorer).  You then get a browse box
which lets you select where on your PC to deposit
the .gif file.  Remember what folder you put it in.

Once the .gif file is on your PC, you have to click
on the file to open it.  That will use the default
graphics program on your computer.  If you right-click
on the file, there may be other programs you can open
it with if you select "Open with...". 

I don't know what program on your PC will happen to open
the file, but something will (possibly a browser).  When
you start to print the file, you may be able to improve
your chances of getting a good print by tweaking the
printer's options before giving the final OK to print.

For example, my HP Deskjet color printer let me select
"Landscape" instead of "Portrait" mode, which means that
it prints sideways and fits on the page better.

Also, my printer let me select print quality, which
defaults to "average".  I chose "Best" (the other option
is "Econo-Fast").  "Best" definitely helped.

Finally, the program on my PC which opened the .gif file
(and from which I printed) was called Microsoft Photo
Editor.   This particular program offers me a print option
to "Fit to a page".  That, combined with telling the
printer to print in Landscape (sideways) mode, got the
entire graphic to print on a single page.

Each program, and each printer, will vary in the
options offered.