Size rectangle with actionscript

1

To size a rectangle I use the following actionscript:


function sizeRectangle() {
    rectangle.onEnterFrame = function() {
        with (rectangle) {
            w = (Stage.width);
            speed = 5;
            _width += (w-_width)/speed;
            if (_width>(w-1)) {
                delete rectangle.onEnterFrame;
                _width = w;
            }
        }
    };
}

It all works fine.
When a certain button is pressed it needs to size itself to zero again.
This is easy to do by altering “w=(Stage.width);” to “w=0;”.
What happends is that it will shrink from right to left.
But how do i code this when I want the rectangle to shrink from left to right?