Setting up websites with Ubuntu 13.04 server and NGINX

Setting up websites with Ubuntu 13.04 server and NGINX

I'm trying to setup 2 websites on my server ---> A_website and B_website
I don't have a domain name registered and I just want to use the site
privately so I'll be accessing it via the static IP address that my ISP
gave me.
I have installed a fresh Ubuntu 13.04 server and I have installed fresh
Nginx + PHP + MySQL by referencing from the following website.
How do I go about setting/configuring my Nginx so that I can access my
websites by typing the following in the browser URL box:
my.isp.address/A_website/index.html and
my.isp.address/B_website/index.html?
Currently it's still pointing to the default Nginx site folder
/usr/share/nginx/html/.