Why won't this piece of code work?

Hello all, i am new to HTML and web design and i'm trying to make a website. I created this piece of code so that when the user mouses over one of the links (jpg image) it will change colors ( i have the same image in different color scheme saved in the same folder).
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>XXXXXXXXXX</title>
</head>
<body bgcolor="#000000">
<table width="1050" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
    <td><table width="1050" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td><img src="_images/XXXXbanner.jpg" width="1050" height="311" alt="banner" /></td>
      </tr>
    </table>
      <table width="901" border="0" align="center" cellpadding="0" cellspacing="0">
        <tr>
          <td width="150"><a href="index.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ButtonOne','','_images/home_on.jpg',1)">
             <img name="ButtonOne" border="0" src="_images/home.jpg" width="150" height="75" alt="home" /></a></td>
          <td width="150"><a href="gallery.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ButtonTwo','','_images/gallery_on.jpg',1)">
              <img name="ButtonTwo" border="0" src="_images/gallery.jpg" width="150" height="75" alt="gallery" /></a></td>
          <td width="150"><a href="products.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ButtonThree','','_images/product_on.jpg',1)">
             <img name="ButtonThree" border="0" src="_images/product.jpg" width="150" height="75" alt="products" /></a></td>
          <td width="150"><a href="store.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ButtonFour','','_images/shop_on.jpg',1)">
             <img name="ButtonFour" border="0" src="_images/shop.jpg" width="150" height="75" alt="store" /></a></td>
          <td width="150"><a href="profile.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ButtonFive','','_images/profile_on.jpg',1)">
             <img name="ButtonFive" border="0" src="_images/profile.jpg" width="150" height="75" alt="profile" /></a></td>
          <td width="151"><a href="contactus.html" onMouseOut="MM_swapImgRestore()" onMouseOver="MM_swapImage('ButtonSix','','_images/contact_us_on.jpg',1)">
          <img name="ButtonSix" border="0" src="_images/contact_us.jpg" width="150" height="75" alt="contact" /></a></td>
        </tr>
      </table>
      <table width="1050" border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td> </td>
          <td> </td>
          <td> </td>
        </tr>
      </table>
      <p> </p>
    <p> </p></td>
  </tr>
</table>
</body>
</html>
the images and banner are showing up fine and i havent mistpyed any of the locations/file names. why doesn't the icon change colors (display the "on" image) when u hover the mouse over it? please help thanks in advance.
** i'm using Adobe Dreamweaver CS4

He's right...
try instering this into the head tags of your html
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
//-->
</script>

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    Space.java_____________________________________________
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    The reason it wasn't working was because you were calling the method after you had set the frame visible, so you saw no change. On top of that, jframe.select.getWidth() only works after the frame is visible in this case. So it's best to set a fixed size for one of them, then use getWidth, or as I did... it's the same thing. I also changed the centerPanel method, I'm not sure if all that's exactly needed, but you can change it back if you think you'll need it.
    import javax.sound.sampled.*;
    import java.awt.*;
    import javax.sound.midi.*;
    import javax.swing.*;
    import java.util.*;
    import java.awt.event.*;
    import java.io.*;
    public class Space extends JFrame implements ActionListener, Runnable{
    //Sound
    Sequence currentSound;
    Sequencer player;
    Thread soundCheck;
    boolean check = true;
    public void start(){
    soundCheck = new Thread();
    soundCheck.start();
    public void run(){
    try{
    File bgsound = new File("Sounds" + File.separator + "Space.mid");
    currentSound = MidiSystem.getSequence(bgsound);
    player = MidiSystem.getSequencer();
    player.open();
    player.setSequence(currentSound);
    player.start();
    checkSound();
    } catch (Exception exc){}
    public void checkSound(){
    while(check){
    if(!player.isRunning()){
                run();
    try{
    soundCheck.sleep((player.getMicrosecondLength() / 1000)-player.getMicrosecondPosition()); // sleep for the length of the track
    }catch (InterruptedException IE){}
    //Screen Variables:
    Dimension SCREEN = Toolkit.getDefaultToolkit().getScreenSize();
    final int SCREENWIDTH = SCREEN.width;
    final int SCREENHEIGHT = SCREEN.height;
    //Panels:
    JPanel select, main, north, south, east;
        //Buttons:
    JButton instructB, cheatB, playB, exit, about;
    //Labels:
    JLabel open, cheat1, cheat2, cheatInstruct, i1, i2 , i3, aboutLabel;
    //The container and frame:
    static Space jframe;
    Container content;
    //The Constructor:
    public Space(){
    super("Space");
    //set  container attributes:
    content = getContentPane();
    content.setLayout(new BorderLayout());
    //init panels:
    main   = new JPanel();
    select = new JPanel();
    north  = new JPanel();
    east   = new JPanel();
    south  = new JPanel();
    //set panel attributes:
    select.setLayout(new GridLayout(3,0,10,10));
    select.setBackground(Color.black);
    main.setBackground(Color.black);
    north.setBackground(Color.black);
    //add panels:
    content.add("West", select);
    content.add("Center", main);
    content.add("North", north);
    content.add("East", east);
    //Image Icons:
    Icon exit1 = new ImageIcon("Images" + File.separator + "exit1.gif");
    Icon exit2 = new ImageIcon("Images" + File.separator + "exit2.gif");
    Icon about1 = new ImageIcon("Images" + File.separator + "about1.gif");
    Icon about2 = new ImageIcon("Images" + File.separator + "about2.gif");
    //init buttons, add their listeners, and set their attributes:
    instructB = new JButton("Instructions", new ImageIcon("Images" + File.separator + "ship.gif"));
    instructB.setContentAreaFilled(false);
    instructB.setForeground(Color.yellow);
    instructB.addActionListener(this);
    select.add(instructB);
    cheatB = new JButton("Cheats", new ImageIcon("Images" + File.separator + "cheat.gif"));
    cheatB.setContentAreaFilled(false);
    cheatB.setForeground(Color.yellow);
    cheatB.addActionListener(this);
    select.add(cheatB);
    playB = new JButton("Play", new ImageIcon("Images" + File.separator + "ship2.gif"));
    playB.setContentAreaFilled(false);
    playB.setForeground(Color.yellow);
    playB.addActionListener(this);
    select.add(playB);
    exit = new JButton();
    exit.setRolloverEnabled(true);
    exit.setIcon(exit1);
    exit.setRolloverIcon(exit2);
    exit.setBorderPainted(false);
    exit.setContentAreaFilled(false);
    exit.addActionListener(this);
    north.add(exit);
    about = new JButton();
    about.setRolloverEnabled(true);
    about.setIcon(about1);
    about.setRolloverIcon(about2);
    about.setBorderPainted(false);
    about.setContentAreaFilled(false);
    about.addActionListener(this);
        north.add(about);
        //Labels:
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