clickable Imagemap in Gwt - gwt

Question

hii i want clickable image map in gwt project...i have created a simple XY map but now i want clickable imagemap...please help me for that
i just want to create a chart where mouse over effect take place....
here is my code
public class ChartGenerator extends ApplicationFrame{
private List<String> trainTypeArray = new ArrayList<String>();
private String lineType;
private List<Long> startTimeOfTrain = new ArrayList<Long>();
private List<Boolean> labelVisibility = new ArrayList<Boolean>();
private List<Integer> stationDistance= new ArrayList<Integer>();
private List<String> lineColorArray = new ArrayList<String>();
private List<String> lineShadeArray = new ArrayList<String>();
private List<String> stationNames = new ArrayList<String>();
private List<String> trainArray = new ArrayList<String>();
private JFreeChart chart =null;
private int startTimeLong;
private int endTimeLong;
private String timezone;
private boolean prediction;
public ChartGenerator(String title, Date dt, String startTime, String endTime, String serviceDirection, String lineType, int delay, boolean prediction) throws BombardierBaseException, BombardierException {
/*super(title)*/;
String[] startSplit = startTime.split(":");
String[] endTimeSplit = endTime.split(":");
this.timezone = startTime +"-"+endTime;
startTimeLong = Integer.parseInt(startSplit[0])*60*60*1000+Integer.parseInt(startSplit[1])*60*1000;
endTimeLong = Integer.parseInt(endTimeSplit[0])*60*60*1000+Integer.parseInt(endTimeSplit[1])*60*1000;
endTimeLong = endTimeLong+(60*1000);
this.prediction = prediction;
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yy");
String dtOfJourney = "'" +sdf.format(dt)+"'";
this.lineType = lineType;
System.out.println("Create data-set now");
final XYDataset dataset = createDataset(dtOfJourney, startTimeLong,endTimeLong,serviceDirection);
chart= createChart(dataset, dtOfJourney, serviceDirection);
}
public int getStartTimeLong() {
return startTimeLong;
}
public void setStartTimeLong(int startTimeLong) {
this.startTimeLong = startTimeLong;
}
public int getEndTimeLong() {
return endTimeLong;
}
public JFreeChart getChart(){
return chart;
}
public BufferedImage getBufferedImage(int width, int height){
ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
return this.chart.createBufferedImage(width,height, info);
}
private double getStationDistion(String name){
return InitializeProperties.getStationDistance(name);
}
private XYDataset createDataset(String dtOfJourney, long startTime,long endTime,String serviceDirection) throws BombardierBaseException {
ResultSet resultSet =null;
Statement readstatement = null;
Connection con = null;
System.out.println("Entering get Connection now");
System.out.flush();
try{
System.out.println("Getting connection");
System.out.flush();
con = InitializeProperties.getConnection();
System.out.println("Connection initialized");
System.out.flush();
readstatement= con.createStatement();
final XYSeriesCollection dataset1 = new XYSeriesCollection();
String lineTypeFilter = "";
if(!this.lineType.equals("A")){
if(lineType.equals("L")){
lineTypeFilter = "and lt.act_lineType like ' '";
}else{
lineTypeFilter = "and lt.act_lineType like '" + this.lineType + "'";
}
}
int n = 0;
String serviceDirectionClause = "";