I'm trying to install bootcamp and XP, but when keyboard does't work. How can I eject the disc?

How can I eject the disc and start over and get into the OSX system?

XP isn't supported in BootCamp, you'll have to use the free VirualBox or one of the other commercial virtual machine softwares to run it in a window on OS X. The performance isn't going to be good enough for 3D games or heavy CPU ones, but good enought for most general use software.
Apple doesn't supply the hybrid MBR and hardware drivers required to run XP in BootCamp any longer. If you were on Snow Leopard 10.6 it's still possible, but not Lion or Mountain Lion.
This is what you do to resolve your problem.
1: Hold the power button down to force a hardware shutdown (emergency use only use the Apple Menu > shutdown all other times)
2: Press and hold the option/alt key on the keyboard.
3: Boot the computer and enter Startup Manager
4: Keep pressing the eject key on the keyboard, the disk will eject.
5: Select OS X to boot from by clicking on the volume and the little arrow that appears.
6: Set Startup Disk in System Preferences  to OS X.
7: Head to BootCamp Utility and use it to remove the BootCamp partition.
8: If you used Disk Utility, then use that to remove the second partition and absorb the remaining space back into the OS X partition.
9: Install VirtualBox, if on 10.8 you migh have to control/right click and "Open" to bypass Gatekeeper controls for the installer and/or program at least once.
10: Read the instructions how to setup and use VirtualBox.

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