image1 = new Image();
image1.src = "images/accueil_on.jpg";

image2 = new Image();
image2.src = "images/services_on.jpg";

image4 = new Image();
image4.src = "images/contact_on.jpg";

image5 = new Image();
image5.src = "images/tutoriaux_on.jpg";

deconnection = new Image();
deconnection.src = "images/se_deconnecter_on.jpg";