var productImages = [];

// Preloaded image. ID = 31
productImages[31] = new Image();
productImages[31].src="/image/product/medium/denimfrenzyclutch_front-1.jpg";
productImages[31].alt = "A perfect clutch to hold your purse, keys and mobile phone";

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