/* EXEMPLE 1 */
if (document.images)
{
	preload = false;

	url = new Array();
	url[0] = "ressources/plan.jpg";
	url[1] = "ressources/enf.jpg";
	url[2] = "ressources/def.jpg";
	url[3] = "ressources/sing.jpg";
	url[4] = "ressources/propre.jpg";
	url[5] = "ressources/darwin.jpg";
	url[6] = "ressources/doc.jpg";

	var i = 0;
	for(i=0; i<4; i++)
	{
		tmp = new Image(435, 430)
		tmp.src = url[i];
	}
	preload = true;
}
function changeImage(img_index) {

	if (document.images && (preload == true)) {
		document.getElementById("plan").src = url[img_index];
	}

}