Problem Setting offscreen background

Hi

I'm trying to create an applet with an image moving down the screen which i have been able to do, but when i try to set background of the offscreen image i get the following when compiling : symbol : method setBackground(java.awt.Color). Is there another way to set the offscreen background. Here is the code.
Many Thanks
Dean

Code:

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import java.awt.*;

public class KelvinIndexLogo extends java.applet.Applet implements Runnable {
        // Define Objects & Variables
        Image logo, workspace;
        Graphics offscreen;
        Thread runner;
       
        int logoY = 0;
        int logoStop;
        // Background RGB values
        int backRed  = 221;
        int backGreen = 221;
        int backBlue  = 221;
        boolean firstRun = true;

       
        public void init() {
                String imageName = getParameter("logo");
                setBackground(new Color(backRed, backGreen, backBlue));
               
                // Get the logo image if the logo parameter has been specified
                if(imageName != null) {       
                        logo = getImage(getCodeBase(), imageName);
                }
        }
       
        public void start() {
                if(runner == null) {
                        runner = new Thread(this);
                        runner.start();
                }
        }
       
        public void stop() {
                if(runner != null) {
                        runner = null;
                }
        }
       
        public void run() {
                // Move the Logo down from the top of the applet
                Thread thisThread = Thread.currentThread();
                while(runner == thisThread) {
                        repaint();
                        try{
                                Thread.sleep(50);
                        }catch(InterruptedException e){}
                       
                        // Would not get the correct image height in the init method
                        // therefore created first run bolean to set the start & Stop points
                        if(firstRun) {
                                logoY    = 0 - logo.getHeight(this);
                                logoStop = getSize().height - logo.getHeight(this);
                                firstRun = false;
                        }
                       
                        logoY++;
                        if(logoY == logoStop) {
                                runner = null;
                        }
                       
                }
        }
       
        public void paint(Graphics screen) {
                // Create the workspace & offscreen objects on each iteration so
                // image is cleared every time and no black trail appears on text
                workspace = createImage(getSize().width, getSize().height);
                offscreen = workspace.getGraphics();
               
                offscreen.setBackground(this.getBackground());
               
                if(logo != null) {
                        offscreen.drawImage(logo, 0, logoY, null);
                }
               
                // Draw workspace to screen & set background colour
               
                screen.drawImage(workspace, 0,0, this);
               
        }
       
        public void update(Graphics screen) {
                paint(screen);
        }
}

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Problem Solved...

Create a filled rectangle the size of the image.

Thanks to CeciNEstPasUnProgrammeur on the Sun Developer Forums for that one.