[Koha] OPAC and Intranet not accessible via Internet

[AD]

Hi,
I have difficulties to make library Opac accessible via Internet. Opac
is working properly on the local host. I changed "localhost" with IP
number but without success (http://localhost/cgi-bin/koha/opac-main.pl
<http://xxxxxxx/cgi-bin/koha/opac-main.pl> ). The same problem is with
the "Intranet."
 
Can anybody advise me how to fix the problem?
 
MySQl and Apache are installed according to the instructions (as far as
I can see). 
 
I use Win XP pro, Koha v.2.2.9; Apache v.2.2.9, My SQL v.4.1, ActivePerl
5.8.9, YAZ toolkit. 
 
I'm connected via LAN. 
 
Sincerely,
 
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