Draw Image button with link in java applet code.

import java.applet.Applet;
import java.awt.*;
import java.net.MalformedURLException;
import java.net.URL;

public class ImageButton extends Canvas
{

    public ImageButton()
    {
        staticImage = null;
        activeImage = null;
        linkURL = null;
        buttonUp = true;
        mouseOver = false;
    }

    public ImageButton(Applet app, String toolType, int border)
    {
        staticImage = null;
        activeImage = null;
        linkURL = null;
        buttonUp = true;
        mouseOver = false;
        this.app = app;
        this.border = border;
        this.toolType = toolType;
        if(toolType.equalsIgnoreCase("View"))
            setSize(25, 30);
        else
        if(toolType.equalsIgnoreCase("Draw"))
            setSize(25, 30);
        else
        if(toolType.equalsIgnoreCase("Text"))
            setSize(25, 30);
    }

    public void setLink(String link)
    {
        thisLink = link;
        try
        {
            linkURL = new URL(thisLink);
        }
        catch(MalformedURLException e)
        {
            linkURL = null;
        }
    }

    public void setStaticImage(Image image)
    {
        staticImage = image;
    }

    public void setActiveImage(Image image)
    {
        activeImage = image;
    }

    public void setTarget(String target)
    {
        thisTarget = target;
    }

    public void update(Graphics g)
    {
        paint(g);
    }

    public synchronized void paint(Graphics g)
    {
        int buttonWidth = size().width;
        int buttonHeight = size().height;
        int buttonWidth1 = staticImage.getWidth(null);
        int buttonHeight1 = staticImage.getHeight(null);
        try
        {
            shadowImage = createImage(buttonWidth, buttonHeight);
            shadow = shadowImage.getGraphics();
        }
        catch(Exception e)
        {
            shadow = null;
        }
        if(mouseOver)
        {
            shadow.setColor(getForeground());
            shadow.fill3DRect(0, 0, buttonWidth, buttonHeight, buttonUp);
            if(activeImage != null)
                shadow.drawImage(activeImage, border, border, buttonWidth - border * 2, buttonHeight - border * 2, this);
        } else
        {
            shadow.setColor(getBackground());
            shadow.fill3DRect(0, 0, buttonWidth, buttonHeight, buttonUp);
            if(staticImage != null)
                if(toolType.equalsIgnoreCase("Text"))
                    shadow.drawImage(staticImage, border, border, buttonWidth - border * 2, buttonHeight - border * 2, this);
                else
                if(toolType.equalsIgnoreCase("Draw"))
                    shadow.drawImage(staticImage, buttonWidth / 4 + 6, buttonHeight / 4 - 2, buttonWidth1 - border * 2, buttonHeight1 - border * 2, this);
                else
                if(toolType.equalsIgnoreCase("View"))
                    shadow.drawImage(staticImage, buttonWidth / 4 + 6, buttonHeight / 4 - 2, buttonWidth1 - border * 2, buttonHeight1 - border * 2, this);
        }
        g.drawImage(shadowImage, 0, 0, this);
    }

    public boolean mouseEnter(Event evt, int x, int y)
    {
        setBackground(new Color(12, 97, 195));
        return true;
    }

    public boolean mouseExit(Event evt, int x, int y)
    {
        setBackground(new Color(208, 228, 123));
        return true;
    }

    public int border;
    public String thisLink;
    public String thisTarget;
    public Applet app;
    public Image shadowImage;
    public Graphics shadow;
    public Image staticImage;
    public Image activeImage;
    public URL linkURL;
    public boolean buttonUp;
    public boolean mouseOver;
    public String toolType;
    public int backRed;
    public int backGreen;
    public int backBlue;
    public int foreRed;
    public int foreGreen;
    public int foreBlue;
}