iis websites, please help

Hi, I am a bit confused on a simple task really,


We have an intranet here a small business server 2003,

on IIS there is a Default Web Site with lots of virtual sites, for
exchange, oma, remote admin etc,
everything is working fine and is accessible from the outside through
our external IP.


I installed Sharepoint services and would like to have the companyweb
or other webs i am creating accessible from the outside too, how do I
do that?

I tried doing it using the same IP but a different port, but apart that
there is a firewall problem for the outside, i have been asked if i
could just have the web as a subdirectory of the main website as seen
from outside, so that people wanting exchange, can go to
mydomain.com/exchange and people wanting sharepoint services
mydomain.com/sharepoint


thank you