Java applet to display sildeshow to images from a given folder

Java applet to display sildeshow to images from a given folder in thumbnail form, images can be selected one by one and can be enable/disable slideshow of images. The thumbnail images are placed in slides folder, the download button(rectangle) downloads the images from the web server, hence a webserver is required eg : any webserver even tomcat webserver with download folder with images*/

Requirements
1. Name of java file : Sildeshow.java
2. Name of images folder : slides
3. Names of images 1.jpg, 2.jpg and so on upto 8.jpg.
3. Name of download folder in webserver : download
4. Download images given below and paste them in slides folder :
1.jpg │2.jpg │3.jpg │4.jpg │5.jpg │6.jpg │7.jpg │8.jpg
5. Download images given below and paste them in download folder in webserver :
1.jpg │ 2.jpg │ 3.jpg │4.jpg │5.jpg │6.jpg │7.jpg │8.jpg

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class Slideshow extends Applet implements Runnable {
 // Variable Declaration
 Thread runner;
 boolean left,right,click,auto;
 boolean but0,but1;
 boolean b0,b1;
 boolean waitMessage = true;
 String str_desc[] = { // Display Messages
  " This is an Abstract piece.Painted on:20/11/86.",
  " This picture is an Abstract work.Painted on:10/1/89.",
  " This picture is a Canvas oil painting (15/8/92).",
  " This is a Pastel painting (2/10/99).",
  " This picture is an Abstract piece.Painted on:6/5/03.",
  " This is a Brush painting (2/6/05).",
  " This a painted collage (30/1/83).",
  " This is my Graphical art piece.Painted on:20/12/08."};
 int number=1;
 static final int MAX=8;
 Image Picture[]=new Image[MAX]; // Image variable
 Image Buffer;
 Graphics gBuffer; // Graphics Variable
 Font a = new Font("Helvetica", Font.PLAIN,12);
 Font b = new Font("Dialog", Font.PLAIN,10);
 Font c = new Font("Helvetica", Font.BOLD,13);
 Rectangle r0=new Rectangle(400,70,50,20); // ON / OFF
 Rectangle r1=new Rectangle(400,195,120,20); // Click Here
 
 void loadGraphics() { //
  Track the status of a number of media objects
  MediaTracker t=new MediaTracker(this);
  for(int i=0;i< MAX;i++) {
    // Load an image in an applet
   Picture[i]=getImage(getCodeBase(),"slides/"+(i+1)+".jpg");
   t.addImage(Picture[i],0);
   try{
    t.waitForAll(0);
   } catch(InterruptedException e) {
   
   }
   waitMessage=false;
  }
 }

 public void init() {
  // Creates an image
  Buffer=createImage(size().width,size().height);
  gBuffer=Buffer.getGraphics();
  // Creates a graphics context for this component
 }

 public void start() {
  if (runner == null) {
   runner = new Thread (this);
   runner.start();
  }
 }
 
 public void stop() {
  if (runner != null) {
   runner.stop();
   runner = null;
  }
 }
 
 public void run() {
  while(true) {
   try {
    runner.sleep(2500);
   } catch (Exception e) { }
   if(auto) {
    if(number< MAX)
    number++;
    else
    number=1;
   }
   repaint();
  }
  }
  
 public void update(Graphics g){ paint(g); }
 
 public void drawArrow(int w,int h,int x,int y,boolean left,boolean over,boolean click) {
  if(click&&over) // set color to yellow on click or mouse over
   gBuffer.setColor(Color.yellow);
  else if(over) // set color to orange on mouse over
   gBuffer.setColor(Color.orange);
  else
  // set color to red on click
   gBuffer.setColor(Color.red);
  if(left) {
   int al[] = {x,x+w,x+w};
   int bl[] = {y+h/2,y,y+h};
   gBuffer.fillPolygon(al, bl, 3);
  } else {
   int ar[] = {x,x,x+w};
   int br[] = {y,y+h,y+h/2};
   gBuffer.fillPolygon(ar, br, 3);
  }
 }

 public void drawPanel() {
  gBuffer.setColor(Color.white);
  gBuffer.fillRect(0,0,size().width,size().height);
  // Display Text
  drawArrow(40,40,330+70,120,true,left,click);
  // Display Left Arrow
  drawArrow(40,40,380+70,120,false,right,click);
  // Display Right Arrow
  gBuffer.setColor(Color.lightGray);
  gBuffer.setFont(b);
  gBuffer.setColor(auto?Color.orange:Color.lightGray);
  gBuffer.fill3DRect(400,70,50,20,!but0);
  // Rectangle for ON rectangle
  gBuffer.setColor(b0?Color.red:Color.black);
  // Color For ON rectangle
  String s=auto?"OFF":"ON";
  gBuffer.drawString(s,410,85);
  gBuffer.setColor(Color.lightGray);
  // Download
  s="Click Here";
  gBuffer.fill3DRect(400,190,120,20,!but1);
  gBuffer.setFont(a);
  gBuffer.setColor(b1?Color.red:Color.black);
  gBuffer.drawString(s,430,205);
  // Display Image
  gBuffer.drawImage(Picture[number-1],20,20,this);
  gBuffer.setColor(Color.black);
  gBuffer.setFont(c);
  gBuffer.drawString("Slideshow:",300,80);
  gBuffer.drawString("Scroll:",300,140);
  gBuffer.drawString("Download it!",300,200);
  gBuffer.drawString("Description:",300,35);
  gBuffer.setFont(a);
  gBuffer.drawString(str_desc[number-1],300,50);
 }

 public boolean mouseDown(Event evt,int x,int y) {
  if(r0.inside(x,y)) {
   but0=true; auto^=true;
  }
  if(r1.inside(x,y))
  {
  but1=true;
  auto=false;
  }
  if(but1)
  {
  String link ="http://localhost:8080/download/"+number+".jpg";
  try {
  // corresponds to an applet's environment
  AppletContext a = getAppletContext();
  URL url = new URL(link);
  // url of the image to be downloaded
  a.showDocument(url,"_blank");
  }
  catch (MalformedURLException e){
  System.out.println(e.getMessage());
  }
  }
  if(left)
  {
  auto=false;
  if(number>1)
  number--;
  else number=8;
  }
  if(right)
  {
  auto=false;

  if(number< MAX)
  number++;
  else
  number=1;
  }
  click=true;
  repaint();
  return true;
  }
 
 public boolean mouseUp(Event evt,int x,int y) {
  but0=but1=click=false;
  repaint();
  return true;
 }

 public boolean mouseMove(Event evt,int x,int y)  {
  Rectangle rl=new Rectangle(330+70,120,40,40);
  Rectangle rr=new Rectangle(380+70,120,40,40);
  if(rl.inside(x,y))
   left=true;
  else
   left=false;
  
  if(rr.inside(x,y))
   right=true;
  else
   right=false;
  
  if(r0.inside(x,y))
   b0=true;
  else
   b0=false;
  
  if(r1.inside(x,y))
   b1=true;
  else
   b1=false;
  repaint();
  return true;
 }
 
 public void paint(Graphics g) {
  if(waitMessage) { 
   g.setColor(Color.blue);
   g.drawString("Loading images, please wait...",200,100);
   loadGraphics();
  } else {
   drawPanel();
   g.drawImage (Buffer,0,0, this);
  }
 }
}