if (document.images)

{

  preload_image_object = new Image();

  // image swap-text

  image_url = new Array();

  image_url[0] = "images/_nav/textswap_profil.jpg";

  image_url[1] = "images/_nav/textswap_studio.jpg";

  image_url[2] = "images/_nav/textswap_pubradiotv.jpg";

  image_url[3] = "images/_nav/textswap_narrlongduree.jpg";

  image_url[4] = "images/_nav/textswap_blablabla.jpg";

  image_url[5] = "images/_nav/textswap_contact.jpg";

  image_url[6] = "images/_nav/textswap_partenaires.jpg";

  //images bouton-over

  image_url[7] = "images/_nav/bt_profil-over.jpg";

  image_url[8] = "images/_nav/bt_studio-over.jpg";

  image_url[9] = "images/_nav/bt_pubradiotv-over.jpg";

  image_url[10] = "images/_nav/bt_narrlongduree-over.jpg";

  image_url[10] = "images/_nav/bt_blablabla-over.jpg";

  image_url[10] = "images/_nav/bt_contact-over.jpg";

  image_url[10] = "images/_nav/bt_partenaires-over.jpg";



   var i = 0;

   for(i=0; i<=3; i++) 

     preload_image_object.src = image_url[i];

}