实现Flash随浏览器宽度变化而居中显示的效果

实现FLASH随浏览器宽度变化而居中显示的效果

这个FLASH的设置的画布宽度应该是1280PX;
但是用1024的显示器也只显示1024,还没有把页面撑开!(其实这个就和网页的背景,是一个道理,先检查浏览器的宽度，然后背景就显示多大)

代码:
Stage.align = "TL";
Stage.scaleMode = "noScale";
MovieClip.prototype.easeTo = function(x, y, speed) {
    this.onEnterFrame = function() {
        if (Math.round(this._x) == Math.round(x) && Math.round(this._y) == Math.round(y)) {
            delete this.onEnterFrame;
        } else {
            this._x = this._x-(this._x-x)/speed;
            this._y = this._y-(this._y-y)/speed;
        }
    };
};
_global.setStagePosition = function() {
    stageHeight = Stage.height;
    if (stageHeight>=750) {
        mainY = 80;
        footerY = 580;
    } else if (stageHeight<=620) {
        mainY = 0;
        footerY = 468;
    } else {
        mainY = stageHeight-630;
        footerY = stageHeight-180;
    }
    tester = mainY;
    _root.main.easeTo(0, mainY, 5);
    _root.footer.easeTo(0, footerY, 5);
};
OBresize = new Object();
OBresize.onResize = function() {
    setStagePosition();
};
Stage.addListener(OBresize);
侦听舞台的当前大小，给MC定位，在html中设置为100%