This I believe is within the shdoclc.dll which can't be modified. This file is reference in the registry for the dnserror.htm and navcancl.htm and a few others like this, and isn't referenced directly by these htm pages but by switches like "shdoclc -5565" to retrieve the dnserror.htm page, or something like that. I've searched on the net but couldn't find anything regarding it and if its possible to change it, but if you do a reg. search for shdoclc.dll, you will find the possibilities to play with. Be prepared to have to restore the reg. if something goes wrong tho.