Newbie having difficulty centering images in browser using ActionScript 3.0

I'm a newbie using flex builder 3. I'm learning
ActionScript3.0. After running the AS code from the book, my images
are never in the center of the browser(IE7). After running the
following code (which is supposed to produce a yellow arrow, in the
center of the stage, that rotates to the mouse), I get all the
desired results except the arrow is positioned in the bottom right
corner of my browser and only part of the arrow is visible. if
anyone can suggest a solution it would be highly appreciated.
Please keep in mind that I am a COMPLETE newbie to ActionScript,
Flex Builder 3, and the Flash environments. Thanks in advance.

on mouseup or click, if the mouse is down, you can use:
stage.focus=outputText;
if the mouse isn't down, you can don't need a listener to trigger the above.

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