Getting around OSX Internet Sharing using VB

[Dasutin]

I'm using a Mac Mini as a HTPC and all of my devices including the Mac Mini are wireless. I built a gaming PC that doesn't have wireless and connect it to my TV to play a popular MMO. To connect it to the internet I'm using the ethernet port from my Mac Mini and turned on Internet Sharing. It works fine but I have an iPhone and want to use Air Mouse on the PC and the Mac Mini creates its own internal network and Air Mouse cannot be seen.

I have VirtualBox installed on the Mac Mini with Windows XP. Is there a way that I can use the bridged connection from the Wireless on my Mac Mini to VirtualBox and send that out to the ethernet port, using another adapter in VB, so if I connect the PC up to the ethernet port it will be on the same network?

Airport Extreme (Wireless) --> MacMini (wireless) --> VB Windows XP --> MacMini (Ethernet) --> PC

I wish OSX just let me simply bridge the two connections together so my PC can be seen by all of the other computers and devices on my network, instead of just being supplied a internet connection. If it won't work then I'll just have to buy a wireless repeater/router or run an ethernet cable from my router to the room where my MacMini and PC is. I just want to see if this will work to save some money