Need efficient way to post "library closing" message

In the past, we have added a message to the top of selected
pages on our web
site to inform our users of the library's closure over the
winter holidays.
For example, we would add a message to our home page, main
database page,
our request forms, "Ask a Librarian" email
reference form, etc. There are
probably about 18 pages that were involved.  We thought that
we should add
this message to more than just our home page as users may
take various
routes to get to a specific page.

I'm wondering if there are other more efficient ways to
handle this other
than manually adding the message to each page and deleting
it after we come
back to school in January.  We recently revised our web site
to be XHTML
compliant and to use style sheets.

Thanks for any suggestions you might have.  Our web site is
at
<http://library.webste
r.edu>. 

Kathy M. Gaynor
Reference Librarian
Emerson Library/Webster University
470 E. Lockwood Ave.
St. Louis, MO 63119
(314) 961-2660 x7811
kgaynorwebster.edu 



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