This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Well, you can't write to a pop-up window before opening it either. If you call window.open(...) and then write to it, it should work - as long as you're not trying to modify some elements of the window before they are loaded (a DIV for example.) In that case you would probably need an onload in there as well.