Listener.onResize

Within flash 8 i’m working the folowing website:
http://www.dri360.com. The centered MC size changes when clicked a button.
I published the movie as a 100% x 100% with a noscale option.

My problem is the next. I want to add a movieclip in my main timeline wich must go automatically to the left of the users screen. if you got 1024x 768 and even when someone got a nice 30" screen from with a resolution from 2560x1600. yesterday i posted a thread and i’ve got the next code wich did not work in my movie. I don’t know if it’s my fault.
the next code i placed in my main timeline:
[AS]
listener.onResize = function ()
{
menuMc._x = menuMc._y = 0;
menuMc._height = Stage.height;
};
[/AS]
Ofcourse
I tried several things today but nothing works. i tried different publish settings. the listener option was new for me and i tried to find out what it does.
I think there is my problem…
do i need to add a line like addListener? or do i need to name the function?
DOes someone can help me out so i can make a menu in the left of the screen without scaling and the movie centered.
If someone knows where i website to learn this type of actionscript.

kind regards Jos Koomen