if (document.images) {
  preload_image = new Image();
  img_path = new Array();

  img_path[0] = "http://cochiro.com/wp-content/themes/conrad/images/link_auto.jpg";
  img_path[1] = "http://cochiro.com/wp-content/themes/conrad/images/link_family.jpg";
  img_path[2] = "http://cochiro.com/wp-content/themes/conrad/images/link_sports.jpg";

  for(var i = 0; i<=img_path.length; i++) {
    preload_image.src = img_path[i];
  }
}

$(document).ready(function(){
  
});