This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
Firefox, and other real browsers, use the standard Event instance as defined by the W3C. IE, on the other hand, uses its own proprietary layout. You need to accommodate both (or use a library like jQuery which normalizes the event object).