bouton = new Image();
bouton.src = "images/logositer.jpg";
boutonlogo = new Image();
boutonlogo.src = "images/menulogo1.gif";
boutondisponibilite = new Image();
boutondisponibilite.src = "images/menudisponibilite1.gif";
boutonpresentation = new Image();
boutonpresentation.src = "images/menupresentation1.gif";
boutoncontact = new Image();
boutoncontact.src = "images/menucontact1.gif";
boutonconnexion = new Image();
boutonconnexion.src = "images/menuconnexion1.gif";
boutonpro = new Image();
boutonpro.src = "images/menuespacepro1.gif";