 
     /**
      *  Adds or subtracts <code>pageSize</code> from <code>value</code>.
-     *  For an add, the new <code>value</code> is the closest multiple of <code>pageSize</code> 
+     *  For an addition, the new <code>value</code> is the closest multiple of <code>pageSize</code> 
      *  that is larger than the current <code>value</code>.
-     *  For an subtraction, the new <code>value</code> 
-     *  is the closets multiple of <code>pageSize</code> that is 
+     *  For a subtraction, the new <code>value</code> 
+     *  is the closest multiple of <code>pageSize</code> that is 
      *  smaller than the current value. 
      *  The minimum value of <code>value</code> is <code>pageSize</code>. 
      *

    }
    
    /**
     *  Handle releasing the increment or decrement button of the scrollbar. 
     *  This ends the stepping operation started by the original buttonDown
     *  event on the button.
     */
    protected function button_buttonUpHandler(event:Event):void
    {

        trackScrollTimer.start();
    }

    /**
     * Animates the operation to move to <code>newValue</code>.
     * The <code>pageSize</code> parameter is used to compute the amount 
     * of time taken to get to that value, so that the time taken to animate
     * a paging operation is roughly the same as the non-animated version; 
     * both operations should end up at the same place at about the same time.
     *
     * @param newValue The final value being paged to.
     * @param pageSize The amount of horizontal or vertical movement requested.
     * This value is used to compute, with the <code>repeatInterval</code> style,
     * the total time taken to move to the new value. <code>pageSize</code>
     * is usually set dynamically by the containing Scroller to the value required
     * to view content at a logical content boundary.
     *  
     *  @langversion 3.0
     *  @playerversion Flash 10
     *  @playerversion AIR 1.5
     *  @productversion Flex 4
     */
    protected function animatePaging(newValue:Number, pageSize:Number):void
    {
        animatingSinglePage = false;
