[Kikasso]

Можно и так, добавить немного инерции:

function startFollowMouse(){
 this.onEnterFrame = function(){
  this._x = ( this._x + this._parent._xmouse)/2;
  this._y = ( this._y + this._parent._ymouse)/2;
 }
}
function stopFollowMouse(){
 this.onEnterFrame = null;
}
<клип>.onPress = startFollowMouse;
<клип>.onRelease = <клип>.onReleaseOutside = stopFollowMouse;