panning image with AS

I am using the following code to pan an image based on the mouse position. All works fine except I want the image to slide to the correct position with easing if you move the mouse off of the stage and then reenter the mouse in a different position from when you left. Right now, what it does is snaps to the mouse instead of sliding to it.

Code:

---

_root.createEmptyMovieClip("holder", 1);
holder.attachMovie("image", "image", 1);
holder._x = 0;
holder._y = 0;
slope = (Stage.width - holder._width)/Stage.width;
vertSlope = (Stage.height - holder._height)/Stage.height;

curXPos = holder._x;
curYPos = holder._y;

_root.onMouseMove = function(){       
        _root.onEnterFrame = function(){
                _root.holder._x = slope*_xmouse;
                _root.holder._y = vertSlope*_ymouse;
               
                curXPos = _root.holder._x = slope*_xmouse;
                curYPos = _root.holder._y = vertSlope*_ymouse;
                trace("x:" + curXPos);
                trace("y:" + curYPos);
                delete(this.onEnterFrame);
        }
}

---

Can somebody take a look or give me an idea as to how I can make it slide to the mouse from the images current position with easing instead of snapping to it? Any help is greatly appreciated.

Hi
Maybe this as a workaround....edit the stage size restraints to suit...
Example:
Put this on a movieclip...

code:

---

onClipEvent (enterFrame) {

	// x movement

	mx = _root._xmouse;

	if (mx<_x) {

		dx = _x-mx;

	} else {

		dx = mx-_x;

	}

	moveSpeedx = dx/3;

	if (mx<_x) {

		_x = _x-moveSpeedx;

	} else {

		_x = _x+moveSpeedx;

	}

	// y movement

	my = _root._ymouse;

	if (my<_y) {

		dy = _y-my;

	} else {

		dy = my-_y;

	}

	moveSpeedy = dy/3;

	if (my<_y) {

		_y = _y-moveSpeedy;

	} else {

		_y = _y+moveSpeedy;

	}

//stage size restraints

	if (this._x>480) {

		this._x = 480;

	}

	if (this._x<0) {

		this._x = 0;

	}

	if (this._y<0) {

		this._y = 0;

	}

	if (this._y>330) {

		this._y = 330;

	}

}

---