Specialeffekter och spelutveckling i Java(TM) -Appleten Button

import java.applet.*;
import java.awt.*;
import java.net.*;

public class button extends Applet {

Image currentimage,normalimage,mouseoverimage;

public void init()
{
    MediaTracker tracker=new MediaTracker(this);

    //Observera att vi nu har
    //getParameter("normalimage")
    //och getParameter("mouseoverimage")
    normalimage=getImage(getDocumentBase(),getParameter("normalimage"));
    tracker.addImage(normalimage,0);
    mouseoverimage=getImage(getDocumentBase(),getParameter("mouseoverimage"));
    tracker.addImage(mouseoverimage,1);
    currentimage=normalimage;
    try {tracker.waitForAll();}
    catch(InterruptedException e)
    {
        System.out.println("Någonting stoppade inladdningen...");
    }
}

public void paint(Graphics g)
{
    g.drawImage(currentimage,0,0,this);
}

public boolean mouseEnter(Event e, int x, int y)
{
    currentimage=mouseoverimage;
    update(getGraphics());
    return true;
}

public boolean mouseExit(Event e, int x, int y)
{
    currentimage=normalimage;
    update(getGraphics());
    return true;
}

public boolean mouseDown(Event e, int x, int y)
{
    String url=getParameter("url");
    String target=getParameter("target");
    gotoURL(url,target);
    return true;
}

public void gotoURL(String address, String target)
{
    URL link=null;
    AppletContext appletcontrol=getAppletContext();
    try {link=new URL(address);}
    catch (MalformedURLException ex)
    {
        showStatus("FELSKRIVEN ADRESS."+address);
    };
    if (link!=null)
    {
        if (target!=null && target.length()>0) appletcontrol.showDocument(link,target);
        else appletcontrol.showDocument(link);
    }
}


}