connecting g3 to imac 27

does anyone have some advice on a simple way to connect these two computers. I'm not having much luck creating a network, or finding a cable that has the correct ends. Seems like they should connect wirelessly...
Any ideas would be greatly appreciated!
-T

You are looking to setup what is called an ad hoc network. Here is a pretty decent article from Macworld on a myriad of ways to do it including wireless.
Ad hoc networking | Utilities - Page 1 | Macworld