Sharing a printer with a MacBookPro

I have an HP model Pavilion a6528p tower PC, a Belkin F6D4230-4 wireless router,
My Brother HL2140-XML laser printer is connected via USB cable to my HP tower PC
My operating system is Windows Vista Home Premium. My ISP is Time Warner Cable.
My wife's laptop is an Apple MacBook Pro and currently accesses the internet via the Belkin router.
NOW,
I want to set up the MacBookPro to send documents wirelessly and print them on the laser printer.
I need instructions on how to set up the Apple MacBookPro.
Thanks.
Winstonh55