Virtualbox on Ubuntu 12.04 lts

Hello everyone ):P

for working purposes I had to install a Windows 2000 virtual machine on my Ubuntu 12.04.

For the moment, everything's working fine, but I can't understand how to connect to the Internet, something like enabling the same wifi connection that's running now on the main machine and make it working even for Win in virtualbox... if it's possible, of course!

Thank you for your answers