Show the browser scrollbar when zooming an image in the Flexbook

public function dragOn( event : MouseEvent ):void {
				book.startDrag();
				book.addEventListener(MouseEvent.MOUSE_UP,dragOff);
			}
			
			public function dragOff( event : MouseEvent ):void {
				book.stopDrag();
				book.removeEventListener(MouseEvent.MOUSE_UP,dragOff);
			}
			
			public  function focusOn(target:*):void {
			/* When the user clicks on a page, if it already has the focus we zoom out to the original size.
			   If the page gets the focus, we zoom in the image.*/ 	
				
				/* We store the current X,Y values of the book for later */
				var bookXPos:int = book.x;
				var bookYPos:int = book.y;
				
				/* We check if the page is already zoomed in... */
				if(landscape.selection.length == 1 && landscape.selection[0] == target)
				{ 
				  /*landscape.selection = [];landscape.height=100;*/
				  
				  /* The image already has the focus, so we must reset the scale and position of the book */
			      book.height = book.height / 2;
			      book.width = book.width / 2;
			      book.x = bookXPos;
			      book.y = bookYPos;
			      
			      /* We reset the cursor to normal mode */
			      book.useHandCursor=false;
				  book.buttonMode=false;
				  book.mouseChildren=false
				  
				  /* Stop the drag so the user can turn the pages again */
			      book.removeEventListener(MouseEvent.MOUSE_DOWN,dragOn);
 
				  /* The mouse wheel is accessible again to zoom */
				  book.addEventListener(MouseEvent.MOUSE_WHEEL,onWheel);
				}
				else
				{ 
				  /*landscape.selection = [target];landscape.height=10;*/
				  
				  /* The image gets the focus, so we must change the scale of the page */
				  book.height = book.height * 2;
				  book.width = book.width * 2;
				  
				  /* The cursor becomes the little hand */
				  book.useHandCursor=true;
				  book.buttonMode=true;
				  book.mouseChildren=true
				  
				  /* The user can now drag the page around to see the whole content */
				  book.addEventListener(MouseEvent.MOUSE_DOWN,dragOn);
				  
				  /* We deactivate the zoom with the mouse wheel */
				  book.removeEventListener(MouseEvent.MOUSE_WHEEL,onWheel);
				}
			}

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