fish1 = new Image(150,110);	fish1.src = "slides/1.jpg";
fish2 = new Image(150,110);	fish2.src = "slides/2.jpg";
fish3 = new Image(150,110);	fish3.src = "slides/3.jpg";
fish4 = new Image(150,110);	fish4.src = "slides/4.jpg";
fish5 = new Image(150,110);	fish5.src = "slides/5.jpg";
fish6 = new Image(150,110);	fish6.src = "slides/6.jpg";
fish7 = new Image(150,110);	fish7.src = "slides/7.jpg";
fish8 = new Image(150,110);	fish8.src = "slides/8.jpg";
fish9 = new Image(150,110);	fish9.src = "slides/9.jpg";
fish10 = new Image(150,110);	fish10.src = "slides/10.jpg";


var totalFish  = 10, 
    currentFish = 1;

function nextFish()
{
  if (++currentFish > totalFish) currentFish = 1;
  document.fish.src = eval("fish" + currentFish +".src");
}