prechargement () {
	var im1 = new Image ();
	im1.src = "imgs/accueil01.jpg";
	var im2 = new Image ();
	im2.src = "imgs/vehicules01.jpg";
	var im3 = new Image ();
	im3.src = "imgs/tarifs02.jpg"
	var im4 = new Image ();
	im4.src = "imgs/devis.jpg";
	var im5 = new Image ();
	im5.src = "imgs/enfants01.jpg";
	var im6 = new Image ();
	im6.src = "imgs/liens01.jpg";
}