I have an HP Officejet J4550 All-in-One printer hooked up to my Mac Pro. I would like to be able to print from my MacBook Air using printer sharing but my Mac Pro is on a different network (I'm at college and my Mac Pro is hardwired, while my MacBook Air is on the wireless network). I've tried setting up printer sharing but can not figure out how to get my Air to see my Pro. Is there some Bonjour setting or something I need to change? Thanks.