if (document.images)
{
  preload_image_object = new Image();
  // set image url
  image_url = new Array();
  image_url[0] = "/car_images/Maserati_GranTurismo-S_92_1024x76811.jpg";
  image_url[1] = "/car_images/Ferrari-Enzo6-1024.jpg";
  image_url[2] = "/car_images/MB_SLR-722_745_1024x7681.jpg";
  image_url[3] = "/car_images/Bentley_GTS_black_ed_2008_04_1024x7681.jpg";
  image_url[4] = "/car_images/Audi_R8V12TDI_2008_05_1024x7681.jpg";
  image_url[5] = "/car_images/Lambo_gallardo_154_1024x7681.jpg";
  
   var i = 0;
   for(i=0; i<=5; i++) 
     preload_image_object.src = image_url[i];
}