function setVisibility(id, visibility) {
document.getElementById(id).style.display = visibility;
}

    if (document.images)
    {
      preload_image_object = new Image();
      // set image url
      image_url = new Array();
      image_url[0] = "http://modelaclub.com/wp-content/themes/modelatheme/images/header2.jpg";
      image_url[1] = "http://modelaclub.com/wp-content/themes/modelatheme/images/header.jpg";

       var i = 0;
       for(i=0; i<=1; i++) 
         preload_image_object.src = image_url[i];
    }