I used the tutorial to create a centered popup window as explained in the tutorial below
http://www.kirupa.com/developer/mx/centered_popup.htm , and it worked just fine in IE and Thunderbird.

What i wanted to do next was to make that popup fill the entire screen, and I did that by changing the width and height values in the AS to screen.width/height, and that worked perfectly in Thunderbird, but it doesn't work in IE; anybody knows where did I go wrong?

PS. The status bar at the bottom of the window stays there no matter the value I assign it in both of the browsers; why is that?