Connect my virtual machine to my internet card

I am using a HP 6735s running a vista home basic operating system, i installed virtual machine for vista which is running windows server 2003 and windows XP.
I connect to the internet using a sierra air card(Express card) on the vista os but i cant connect the operating systems on the virtual machine to the internet using the air card.
Please how can i acheive this connection beause the vitual machine does not have the modem listed in the drivers.