How to mapping "Eject" key on Non-Mac keyboard? I've gotten a new USB keyboard for my Mac. It is a Windows keyboard, but after remapping the Alt and Windows keys, it works just like a Mac keyboard. It is missing one particular feature and that is the "Eject" key. I'm not sure how to remap that command to another key. Where can I find that command? 
Also if I can assign volume up and volume down to control the sound from the keyboard. 

If anybody knows of a way to resolve this issue, I would greatly appreciate it.
One way you can eject a disk without remapping keys is to use the Eject Menu Extra item.
Just navigate to the /System/Library/CoreServices/Menu Extras/ folder and double-click on the Eject.menu file. It will put the 'eject' icon in the menu bar:

For me, this has worked for both internal and external drives. One click and the drive opens like magic!