I have a question, I am running OS X 10.5.4 my apache/mysql/phpmyadmin etc is running well.

I can see http://localhost:8888/sitename.com

all of which I am happy with, but I have just moved over to mac, and don't yet know how to change the config so I can do this

Site Dir: /user/wwwroot/sitename.com

In Firefox (type address): http://dev.sitename.com

on a windows system this is setup in /etc/hosts, but have no idea on a mac

plz help and thanks in advance.