Dynamic GIF Creation thru JSP

Hi All,
I am able to create .bmp file by using the following code.But I need to create a GIF instead of BMP.
The code follows as
<%
BufferedImage image =new BufferedImage(1000,1000,BufferedImage.TYPE_INT_RGB);
Graphics graphics = image.getGraphics();
graphics.setColor(Color.black);
graphics.fillRect(0,0,1000,1000);
graphics.setColor(Color.red);
graphics.setFont(new Font("arial",80,80));
graphics.drawLine(20,980,980,980);//Horizontal Line
graphics.drawLine(100,20,100,990);//Vertical Line
graphics.dispose();
ServletOutputStream sos = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
encoder.encode(image);
%>
How can I create GIF file.Please help me.
Thanks in advance.

You may want to have a look at this...
http://www.acme.com/java/software/Acme.JPM.Encoders.GifEncoder.html

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