function prepare_images()
{
 n_pic1 = new Image();
 n_pic1.src = "images/p_kuba_.jpg";

 n_pic2 = new Image();
 n_pic2.src = "images/p_elysium_.jpg";

 n_pic3 = new Image();
 n_pic3.src = "images/p_stub_.jpg";

 n_pic4 = new Image();
 n_pic4.src = "images/p_timbero_.jpg";


}