if (wrong < 100) {
chart.addHorizontalRangeMarker(Math.max(wrong, 0), 100, Color.LIGHTCORAL);
}
String url = chart.toURLForHTML();
// Somewhat less than clean
String pageStart = "<html><head><title>" + title + "</title></head><body>";
String img = String.format("<img src=\"%s\"/>", url);
String pageEnd = "</body></html>";