Text blurry when load mc into empty container

1

How do i keep the text crisp when i load the text into and empty container. This is the code i used

var stageListener:Object = new Object();
speed = 10;
this.onEnterFrame = function() {
    StageWidth = Math.round(Stage.width);
    StageHeigth = Math.round(Stage.height);
    Xlimit = Math.round(StageWidth/2)-(this.myBox._width/2);
    Ylimit = Math.round(StageHeigth/2)-(this.myBox._height/2);
    this.myBox._x += (Xlimit-this.myBox._x)/speed;
    this.myBox._y += (Ylimit-this.myBox._y)/speed;
};

i thought the Math.round will keep the text as whole number