if (document.images)
{
  var preloaded = new Array();
  function preload_images() {
      for (var i = 0; i < arguments.length; i++){
          preloaded[i] = document.createElement('img');
          preloaded[i].setAttribute('src',arguments[i]);
      };
  };
  preload_images(
      '/images/button_register_over.zh-cn.jpg',
      '/images/button_deposit_over.zh-cn.jpg',
      '/images/deposit_over.zh-cn.jpg',
      '/images/why_join_us_over.zh-cn.jpg',
      '/images/loyalty_over.zh-cn.jpg'
  );
}