function changeBackground() {
	var images = new Array("1_Verandas.jpg", "2_Chassis.jpg", "3_Prod_Ver.jpg", "4_Volets.jpg", "6_Cloisons.jpg")
	var randomnumber = Math.floor(Math.random()*5);
	$("container").setStyle({
		backgroundImage: "url(../images/contenu/1024/" + images[randomnumber] + ")"
	});
} // changeBackground

Event.observe(window, "load", changeBackground);