ActionScript 3.0 :: Getting The Real Movie Width From The Stage?

I need to get some parameters of a movie adding an as3 code to the beginning. As the code will be inserted in many movies, I need it to be 'general' without any reference to the names of the clipsIn particular, I need to retrieve mouse coordinates and the real movie width. For real movie width I mean the width to whom are referred the mouse event stageX and stageY.For example in this movie http:[url]... the width I'm talking about is the white frame. In fact if you use

ActionScript Code:
stage.addEventListenere(MouseEvent.CLICK,func);
function foo(e:MouseEvent):void[code]....

to get coordinates onclick and you click on the top-left corner of the white layer you'll get 0-0 or similar values.I tried to get that relative width using

ActionScript Code:
stage.stageWidth

but this returns me just the object width (so 100% of my page in the previous example) while I need only the white part width.how can I do this without using any name and referring just to the stage of my scene?