var productImages = [];
var productImagesIndex = 0;
var timeout = 3000;

function initChanger() {
    setTimeout('changeProductImage()',timeout);
    productImages = ["2116","2117","2126","2128","2129","2132","2134","2136","2138","2139","2141","2143","2145","2146","2149","2151","2153","2155","2157","2160","2162","2164","2168","2170","2173","2175","2177","2180","2182","2184","2185","2187","2189","2192","2193","2196","2198","2200","2203","2204","2206","2209","2210","2213","2216","2218","2220","2222","2223","2225","2228","2229","2230","2232","2234","2236","2242","2248","2251","2253","2255","2257","2258","2264","2270","2273","2274","2278","2280","2282","2283","2285","2287","2292","2293","2298","2323","2325","2327","2329","2332","2334","2336","2338","2340","2342","2344","2346","2348","2350","2352","2354","2356","2358","2360","2362","2364","2366","2368","2370","2372","2374","2376","2378","2380","2382","2384","2387","2389","2391","2393","2399","2401","2404","2407","2408","2410","2413","2417","2418","2420","2424","2426","2429","2431","2433","2434","2470","2472","2474","2476","2478","2479","2481","2484","2486","2487","2491","2493","2495","2497","2498","2500","2509","2512","2514","2515","2518","2520","2522","2524","2526","2528","2530","2532","2533","2536","2538","2539","2542","2543","2546","2547","2550","2551","2553"];
}

function changeProductImage() {

  productImagesIndex = Math.round( Math.random() * productImages.length );

  var imgObj=document.images['product_image'];
  var newImage = "images/IMG_"+productImages[productImagesIndex]+'.jpg';

  if(imgObj)
    imgObj.src=newImage;

  setTimeout('changeProductImage()',timeout);
}