Bluetooth and wireless keyboard

I'm using a G4 Gigabit with OS 10.5.6 which has a 1 GHz processor with 1 gig of memory. Bruce Johnson says the apple wireless keyboard should work with a blue-tooth dongle. I bought a apple wireless keyboard on eBay and a d-Link DBT-120 dongle also on eBay. I was told this should be plug and play. It's not and the only thing in the Application folder is Bluetooth File Exchange which shows "no bluetooth hardware" I have a disk that came with the keyboard which installs a keyboard updater. The d-Link has a disk but everything on it is for Windows. I erased and installed OS 10.5 and used the combo updater to OS 10.5.6 and still the keyboard will not work. Brand new batteries in the keyboard. I have restarted with the keyboard on and again with it off. Anyone know how to get this to work?
Thanks
Norm

 

OK I will thanks