      *
      *  @param playheadTime The position, in milliseconds, between 0
      *  and the value of the <code>duration</code> property.
+     *  
+     *  @langversion 3.0
+     *  @playerversion Flash 10
+     *  @playerversion AIR 1.5
+     *  @productversion Flex 4
      */ 
     public function seek(playheadTime:Number, includeStartDelay:Boolean = false):void
     {

     * running or not. The value is <code>false</code> unless the animation
     * has been played and not yet stopped (either programmatically or
     * automatically) or paused.
     */
    public function get isPlaying():Boolean
    {

     * Adds a new animation to the system. All animations run off the same
     * single Timer, so starting any one animation simply adds it onto the
     * static list of active animations.
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    private static function addAnimation(animation:Animation):void
    {
