zope urls

[rihad]

(Sorry if this is not the right place to ask Zope questions - didn't
find one)

I'm trying to learn Zope by playing on http://localhost:8080 which is
mapped to by Apache's ProxyPass directive thru http://localhost/zope/.
The other day I installed Squishdot as a product, and everything
worked. But when I wanted to show someone over the net what I had done
by giving them my IP address, I realized that all links within
Squishdot are starting with http://localhost:8080/ which of course did
not work for them.

I've heard about this SiteRoot thing but have no idea as to how to
configure it since my IP address is assigned to me dynamically by my
ISP.

I'd be very grateful for any help.