var imgs = new Array( 
"./images/barre_navig/hover/accueil.png",
"./images/barre_navig/hover/news.png",
"./images/barre_navig/hover/livres.png",
"./images/barre_navig/hover/serv.png",
"./images/barre_navig/hover/actif.png"
);

for( var i = 0 ; i < imgs.length ; i++ ) {
	var tmp = imgs[i];
	(imgs[i] = new Image()).src = tmp;
}