Ok this is what I did and It doesnt work :(

first I edited site_html_templates.pl by adding
header_links => &header_links, to global
Then I added
sub header_links {
# -----------------------------------
# This is the header file to insert into your LINKS pages.
open (INC, "/big/dom/xweb_toolz/cgi-bin/advert/remote.pl?region=big125&mode=SSI") or return "Can't find include file: header_links.txt";
return join ("", <INC> );
}

I keep getting "Can't find include file: header_links.tx" If I remove the "?region=big125&mode=SSI" from the
end of cgi file then it just prints the content of cgi file. I have been working on this for hours and I am simply going crazy. Any help?