Port forwarding to expose home web server

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http://serverfault.com – I would like to setup a personal home server, I bought a mac mini and I installed Ubuntu server on a Virtualbox machine using bridge adapter. All is fine, I can type the ip of the VM in any browser of any pc in my home network and I can see a welcome page served by Apache ("it works!"). So far so good... but now I want to be able to expose my web server to the outside world! I've got a Linksys wag320n router and I configured it to forward http request on port 80 to the ip of the virtual machine. The problem is that if I type my public ip (that one my router assign to me in order to access the (HowTos)