var delay = 6000;
var counter = 0;
var imgs = new Array();

function preloadImages(){
if (document.images)
{
  img1 = new Image(200, 150); 
  img1.src='images/thumbs/bounce/bounceMenuThumb.png'; 
  
  img2 = new Image(200, 150); 
  img2.src="images/thumbs/bounce/bounceFishThumb.png"; 
  
  img3 = new Image(200, 150); 
  img3.src="images/thumbs/bounce/bounceFantasyThumb.png"; 
  
  img4 = new Image(200, 150); 
  img4.src="images/thumbs/bounce/bounceSpaceThumb.png"; 
}

imgs[0] = img1.src;
imgs[1] = img2.src;
imgs[2] = img3.src;
imgs[3] = img4.src;
rotateImages();
}

function rotateImages(){
  if(counter == (imgs.length)){
    counter = 0;
  }
  document.getElementById('bounceThumb').src=imgs[counter];
  counter++;
  setTimeout('rotateImages()', delay);
}