Well, the OP did say what printer it was (it's certainly an OS X supported printer), and what OS version they are using. I've no personal experience with that printer so I can't offer useful advice (which doesn't mean that I am happy to see incorrect advice). An offline printer can be something as simple as a paper jam to a more complicated issue such as a network problem.
I used to find it hard enough to solve some printer problems when I had access to the computer and the printer; without that it's really tough. The best I can suggest is to follow Apple's recommended troubleshooting procedure as detailed here : http://support.apple.com/kb/TS3140?viewlocale=en_US&locale=en_US
(It says 10.5 and earlier but these principles hold for any OS version.)