var chemin = "demo/preload/";
var ext = ".gif";
var liste_images = new Array('photo_on','visuel1_on','visuel2_on','logo_on','animation_on');

document.image_chargee = new Array();

function prechargement() {
	for ( i = 0; i < liste_images.length; i++ ) {
		document.image_chargee[i] = new Image;
		document.image_chargee[i].src = chemin + liste_images[i] + ext;
		}
	}