From Apple Knowledge Base Article 86651
http://docs.info.apple.com/article.html?artnum=86651
"Question 6: Can I use the Apple Wireless Keyboard to start up from CD, start up into Open Firmware, or start up in Safe Mode?
Answer: If your computer has built-in Bluetooth or the D-Link DBT-120 (Rev B2 or later) adapter, you can use the Apple Wireless Keyboard and Mouse to initiate most startup commands. See document 75459, "Mac OS X: Keyboard Shortcuts".
Pressing the eject key as the computer starts up does not eject a disc from the disc drive the way a wired keyboard does. To eject a disc at startup, hold down the mouse button.
Note: Although you can use a wireless keyboard to start up in Single-User mode or in Safe Boot mode, they will not work once the computer is started up in these modes. To continue in Single-User mode or in Safe Boot mode, use a wired keyboard and mouse."