How do you change the logo URL

To clarify,  I know how to assign the logo image in
localsettings.php
....
 
The default behavior is for the logo image to be linked (or
points at)
the mainpage of the wiki.
Like http://mywiki.blah.c
om/main_page .  But I want it to remain an
image AND point to our college home page http://www.holycross.edu
.
 
The suggestion to hack monobook.php seems like it will work
but I
really would prefer a solution in either localsettings.php
or from
inside the wiki.
 
Thanks in advance for any help.
Audrey
 
-===-===-===-===-===-===-===-===-
Audrey L. White
Web Developer
College of the Holy Cross
Information Technology Services
Smith Hall - Room 101
Box ITS - One College Street
Worcester, MA  01610-2395
ph 508/793-3846
fax:  508/793-2711
AWhiteholycross.edu
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Audrey:
if you want to link an image to an arbitrary target
(internal wiki page 
or external URL), you can use the so-called imagelink
extension 
originally written by Brion
See 
http://www.google.de/sea
rch?hl=de&q=mediawiki+imagelink.php&btnG=Suche&m
eta= 
for current locations on the Web.

> To clarify,  I know how to assign the logo image in
localsettings.php
> ....
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