if (document.images)  {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "http://www.zengardenspa.com/images/4corners.jpg";
      image_url[1] = "http://www.zengardenspa.com/images/top_bar.gif";
      image_url[2] = "http://www.zengardenspa.com/images/zcs_banner_2.jpg";
      image_url[3] = "http://www.zengardenspa.com/images/home.gif";
      image_url[4] = "http://www.zengardenspa.com/images/aboutus.gif";
      image_url[5] = "http://www.zengardenspa.com/images/Directions.gif";
      image_url[6] = "http://www.zengardenspa.com/images/ContactUs.gif";
      image_url[7] = "http://www.zengardenspa.com/images/spaTour.gif";
      image_url[8] = "http://www.zengardenspa.com/images/SpaEtt.gif";
      image_url[9] = "http://www.zengardenspa.com/images/Services.gif";
      image_url[10] = "http://www.zengardenspa.com/images/bg2.jpg";
      image_url[11] = "http://www.zengardenspa.com/images/top_image_2_r1_c1.jpg";
      image_url[12] = "http://www.zengardenspa.com/images/top_image_2_r1_c2.jpg";
      image_url[13] = "http://www.zengardenspa.com/images/top_image_2_r1_c3.jpg";
      image_url[14] = "http://www.zengardenspa.com/images/bottom2.gif";
      image_url[15] = "http://www.zengardenspa.com/images/giftCrt.gif";
      image_url[16] = "http://www.zengardenspa.com/images/Specials.gif";
      
       var i = 0;
       for(i=0; i<=16; i++) {
         preload_image_object.src = image_url[i];
       }
    }