function preload()
{
image_1 = new Image();
image_1.src = "../images/devenez-client/photo-superman.jpg";
image_2 = new Image();
image_2.src = "../images/devenez-client/photo-entreprise.gif";
image_3 = new Image();
image_3.src = "../images/devenez-client/photo-collectivite.gif";
image_3 = new Image();
image_3.src = "../images/devenez-client/photo-association.gif";
}