how to have codeigniter on a port and http without codeigniter on another port?

[eluser]Unknown[/eluser]
I would like to learn codeigniter framework but also be able to have a regular HTTP web site to test single php pages on while I get accustomed to codeigniter. Does anyone have a clue how to set it up? I have a g5 Mac running apche2 on leopard. I also have a loop back web site name that updates changed IP addresses that are from using DHCP from ATT DSL(I don't have a static IP address) but I have dyndns a software that updates the IP address attached to my server name. It works fine with codeigniter. So I have codeigniter on port 80. Can I have CodeIgniter on 8080 and a on port 80 HTTP without a framework?
thanks,