window.onload = init;
function init()
{
    if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "/yourspacehomes/images/rental_over.jpg";
      image_url[1] = "/yourspacehomes/images/shared_over.jpg";
      image_url[2] = "/yourspacehomes/images/buy_over.jpg";
      image_url[3] = "/yourspacehomes/images/faq_sml_over.jpg";
      image_url[4] = "/yourspacehomes/images/rental_sml_over.jpg";
      image_url[5] = "/yourspacehomes/images/shared_sml_over.jpg";
      image_url[6] = "/yourspacehomes/images/purchase_sml_over.jpg";

       var i = 0;
       for(i=0; i<=3; i++) 
         preload_image_object.src = image_url[i];
    }
}