Html flash embed help

Take a look here:

just an example of a movieclip 1000x600px, nothing else on stage.

this is the code from the flash, so i want it centered:

stage.align = "topLeft";
stage.scaleMode = "noScale";

stage.addEventListener(Event.RESIZE, onResizeS);

function onResizeS(e:Event):void{
    mc.x = (stage.stageWidth / 2  - mc.width / 2);
    mc.y = (stage.stageHeight / 2  - mc.height / 2);
}

onResizeS(null)

why does it show me vertical scrollbar?

what do i need to set in html style so that the scrollbars are hidden, and show only if window size get smaller than flash size (in this case 1000x600px)