Bug 132914 "Invalid page number" error message is hard coded.
"Invalid page number" error message is hard coded in DocumentProcessor.java. This must be externalized into *.properties file. If there are other hard coded error messages, please also externalize.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/presentation/aggregation/layout/FramesetFragment.java
this.doPreService( request, response );
			this.doService( request, response );
			this.doPostService( request, response );
		}
		else
		{
			super.doPreService( request, response );
			super.doService( request, response );
			String target = super.doPostService( request, response );
			if ( target != null && target.length( ) > 0 )
			{
				RequestDispatcher rd = request.getRequestDispatcher( target );
				rd.include( request, response );
			}
		}
	}
	/**
	 * Anything before do service.
	 * 
	 * @param request
	 *            incoming http request
	 * @param response
	 *            http response
	 * @exception ServletException
	 * @exception IOException
	 */
	protected void doPreService( HttpServletRequest request,
			HttpServletResponse response ) throws ServletException, IOException
	{
		assert ParameterAccessor.PARAM_FORMAT_PDF