<!--
if (document.images)
{
  preload_image_object = new Image();
  // set image url
  image_url = new Array();
  image_url[0] = "back_topmain1.jpg";
  image_url[1] = "back_topmain2.jpg";
  image_url[2] = "back_topmain3.jpg";
  image_url[3] = "back_topmain4.jpg";
  image_url[4] = "back_topmain5.jpg";
  image_url[5] = "back_topmain6.jpg";
  image_url[6] = "back_topmain7.jpg";   
   var i = 0;
   for(i=0; i<=6; i++)
   {
     preload_image_object.src = image_url[i];
   }
}
//-->