var productImages = [];

// Preloaded image. ID = 84
productImages[84] = new Image();
productImages[84].src="/image/product/medium/icecreamsundae_a.jpg";
productImages[84].alt = "Ice cream sundae zip pouch";

         

// Preloaded image. ID = 85
productImages[85] = new Image();
productImages[85].src="/image/product/medium/icecreamsundae_b.jpg";
productImages[85].alt = "Ice cream sundae zip pouch";

         
function swapImage(image) {
   document.prodImageMain.src = productImages[image].src; 
}