Full Flash Site Placing MCs Objects

Hi everyone. I can't find or figure out how in the world to place certain mc holders and symbols in certain x' and y's of the stage. Is there a tutorial on how to do this that's good?

Right now I'm trying to get the logo in the upper right hand corner of the full web browser and have it auto resize perfectly all I have right now is it over to the right but can't seem to figure out how to get it to go up towards right corner perfectly.

Here is some of what I have.

bottomBar_mc._y = Stage.height;
bottomBar_mc._x = 0;
bottomBar_mc._width = Stage.width;
//
btFullScreen._x = Math.floor (Stage.width / 2);
btFullScreen._y = Math.floor (Stage.height);
//
loader._x = Math.floor (Stage.width / 2);
loader._y = Math.floor (Stage.height / 2);
//
logoPng._x = Stage.width/1-logoPng._width/1;

//