banner_img_list = new Array(
"chou_banner.gif", 
"milka_banner.gif", 
"sonotone_banniere.gif", 
"agarik_banner.gif", 
"fluff_banner.gif", 
"gazette_banner.jpg", 
"ras_banner.jpg"
);
banner_a_list = new Array(
"http://choucrouteweb.net", 
"http://camillemilka.free.fr", 
"http://sonotoneimperial.free.fr", 
"http://agariketrok.free.fr/", 
"http://fluff.free.fr", 
"http://oti-island.net/Gazette", 
"http://deepshit.free.fr"
);
var banner_number = Math.floor(banner_img_list.length*Math.random());

function webring_apres() {
    if(banner_number == banner_img_list.length - 1) {
        banner_number = 0;
    } else {
        banner_number ++ ;
    }
    document.getElementById("banner_img").src = "images/bannieres/" + banner_img_list[banner_number];
    document.getElementById("banner_a").href = banner_a_list[banner_number];
}

function webring_avant() {
    if(banner_number == 0) {
        banner_number = banner_img_list.length - 1;
    } else {
        banner_number -- ;
    }
    document.getElementById("banner_img").src = "images/bannieres/" + banner_img_list[banner_number];
    document.getElementById("banner_a").href = banner_a_list[banner_number];
}