function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

var preloadFlag = false;
  if (document.images) {
    button00_over = newImage("images/button00_over.jpg");  
    button01_over = newImage("images/button01_over.jpg");  
    button02_over = newImage("images/button02_over.jpg");  
    button02a_over = newImage("images/button02a_over.jpg");  
    button02b_over = newImage("images/button02b_over.jpg");  
    button02c_over = newImage("images/button02c_over.jpg");  
    button03_over = newImage("images/button03_over.jpg");  
    button04_over = newImage("images/button04_over.jpg");  
    button05_over = newImage("images/button05_over.jpg");  
    button06_over = newImage("images/button06_over.jpg");  
    button07_over = newImage("images/button07_over.jpg");  
    preloadFlag = true;
  }