try {
                if ( qimg.Width > 258 ) {
                    prev_width = qimg.Width / ( qimg.Width / 258 );
                    prev_height = qimg.Height / ( qimg.Width / 258 );
                }
                else if ( qimg.Height > 225 ) {
                    prev_width = qimg.Width / ( qimg.Height / 225 );
                    prev_height = qimg.Height / ( qimg.Height / 225 );
                }
                else if ( qimg.Width < 258 && qimg.Height < 225 ) {
                    prev_width = qimg.Width;
                    prev_height = qimg.Height;
                }
            }