Can you make a IMAC G5 wireless????

I have a wireless network setup in the home for my laptop. I use a linksys wrt54g which is presently connected to my MAC. And an eternet router by Linksys computer closet. I want to move my home office to a new location and it does not have a computer cable outlet. Is there something I can do with what I have or do I need to buy anything else to make my MAC run at the new location without having direct plug into the wall. Isn't that what I use airport for?????