function preload() {
	var max = 4;
	imageObj = new Image();
	
	images = new Array();
	for(i=1 ; i<=max ; i++) {
		imageObj.src = "photos/photo" + i + ".tn.jpg";
	}
} 

function changerPhotosGauche(id) {
	document.getElementById("photo_gauche").src = "photos/photo"+ id +".tn.jpg";
}

function changerPhotosDroite(id) {
	document.getElementById("photo_droite").src = "photos/photo"+ id +".tn.jpg";
}