if(document.images) {
    facebook = new Image;
    facebook = "images/facebook2.png";
    tendance = new Image;
    tendance = "images/tendance2.png";
    hotesse = new Image;
    hotesse = "images/hotesse2.png";
    delegue = new Image;
    delegue = "images/delegue2.png";
    intemporelle = new Image;
    intemporelle = "images/intemporelle2.png";
}